Administration officials said yesterday that stiff trade sanctions against Nicaragua, including a possible ban of exports and imports, are almost certain to go into effect as part of the current review of U.S. policy.

The officials said recommendations for a trade embargo would be given to President Reagan today before he leaves for the economic summit meeting in Bonn.

Although Reagan has not approved such a move, "every single constituency was represented in the members of Congress who called for it," one senior administration official noted. "Nobody spoke against it."

Reagan said yesterday that "we're not going to give up" trying to maintain pressure on Nicaragua and lambasted Congress for refusing last week to grant his request for $14 million in military aid to rebels fighting Nicaragua's leftist Sandinista government.

Speaking to a group of foreign journalists, Reagan said members of Congress, "whatever way they may want to frame it . . . they really are voting to have a totalitarian Marxist-Leninist government here in the Americas, and there is no way for them to disguise it."

The State Department, meanwhile, confirmed that seven Nicaraguan "support agents" for a group of leftist guerrillas in Honduras were captured there between April 11 and April 14.

"The seven acknowledged that their mission was to smuggle weapons from Nicaragua to Chinchonero guerrilla groups . . . and to assist with recruitment and training," State Department spokesman Edward Djerejian said.

One of the seven, who said he was group coordinator and an agent of the Nicaraguan equivalent of the CIA, the General Directorate of State Security, said he and others had made three trips since last November smuggling rifles, handguns, uniforms, boots, money and medicines to guerrillas in Olanchos Province in southeastern Honduras, according to Djerejian.

A senior State Department official said he is "not surprised" by the report and charged that Nicaraguans "are actively training Costa Ricans with exactly the same mission in mind."

He said the State Department has "irrefutable evidence" that about 200 Costa Ricans have been training in Nicaragua and Cuba for two years, but he declined to make any evidence public. "It's just a question of when" they begin guerrilla activity, he said.

Nicaraguan officials have repeatedly denied links to Honduran or Costa Rican unrest.

Economic sanctions have been posed every time decision-makers discussed possible options on Nicaragua, but political costs at home and in world trade relations have seemed to outweigh the benefits, several officials said yesterday.

"What do you gain?" a senior White House official said earlier this month in explaining why Reagan had chosen another course in his April 4 initiative on Nicaragua.

"You can close down $25 million in foreign exchange" but only at the cost of possible "reprisals" from European and other nations just as Reagan begins economic summit meetings aimed at reopening tariff negotiations next year, the official said.

In Bonn this week, Reagan is expected to press for a lowering of trade barriers, a position that could cause discomfort if he were raising them at home against Nicaragua.

But the debate in Congress changed those perceptions. In an apparent signal of White House intentions, chief of staff Donald T. Regan, appearing Sunday on CBS-TV's "Face the Nation," said it was "kind of ironic" that, although Nicaragua is "a communist nation" and President Daniel Ortega is visiting Moscow "for further instructions and more money, to pursue disruptions among his neighbors . . . yet we continue to buy his coffee and his bananas. Why do we do that?" he asked rhetorically.

Treasury Secretary James A. Baker III said in a briefing yesterday that economic sanctions would not conflict with Reagan's stand in Bonn. "It may be that there can be some mix between trade and politics," he said.

When the Sandinistas took power in 1979, U.S. trade supplied about 80 percent of Nicaragua's export income. After 1981, Nicaragua began seeking other markets, and the figure is now about 17 percent.

Still, an embargo would have a major impact on Nicaragua's tiny, shaky and relatively primitive economy, which has a gross domestic product of only $3.1 billion.

An end to U.S. trade would hurt Nicaraguan agriculture most, according to State Department figures. Nicaragua spent $111.5 million for U.S. products in fiscal 1984, about one-fifth of its imports and most of it for pesticides, fertilizers, feed, agricultural machinery and spare parts. It exported about $57 million worth of bananas, beef, shellfish and coffee.