Arab leaders are expected to outline a "global confrontation strategy" against Israel and its supporters -- including the United States if Washington's Middle East policy does not change -- at a summit meeting next month, according to Arab League Secretary General Chedli Klibi.

Klibi indicated in an interview at league headquarters here, however, that the heads of state would probably shy away from endorsing calls by some militant states for immediate economic sanctions against Israel's allies.

"The first thing to do in the face of things in Lebanon is to work out a global strategy based on confrontation that will deal with the aggression of Israel," Klibi said.

"You can expect a final declaration measured in tone. There will be no invective, no slogans. But I hope we will succeed in setting up a global confrontation strategy in which we shall outline all our fighting means."

By this, Klibi said he meant that the final summit declaration could well contain a threat to invoke economic sanctions along with other measures. Pressed on specifics, he said the Arab strategy would be "centered mainly on moral force and international principles of justice and peace" -- principles he said Israel's action in Lebanon had undermined.

The remarks by the league's top administrator seemed to reflect an eagerness among Arab states to make up for their lack of action during the Israeli advance into Lebanon. But weakened control of the world oil market and policy differences dividing Arab states have decreased the likelihood of united pressure tactics against Israel's supporters comparable to the oil embargo imposed after Israel's 1973 war with Egypt.

On the other hand, the Israeli invasion does appear to have strengthened Arab unity by moving Egypt closer to Arab League acceptance. Klibi said the question of readmitting Egypt likely would be considered by Arab foreign ministers meeting this weekend in Mohammedia, Morocco, to fix the agenda for the summit, tentatively scheduled for Sept. 6.

Egypt, the only Arab state to sign a peace treaty with Israel, has been banned from Arab League meetings since 1978. Following the attack on Lebanon, Egypt has distanced itself from Israel.

Klibi, who is Tunisian, warned that the Reagan administration is risking a break with the Arab world if it does not control Israel and revise its policy to recognize the right of a Palestinian state to exist.

The last Arab League summit in November was suspended following a deadlock over an eight-point plan put forward by Saudi Arabia which, among other things, called for the establishment of an independent Palestinian state in the Israeli-occupied West Bank and Gaza Strip and the right of all nations in the Middle East to live in peace.

Further discussion of the Saudi plan, Klibi said, "depends on what backing the United States appears ready to give to the proposal."

An alternate plan, which Tunisian President Habib Bourguiba asked this week to be placed on the agenda, goes beyond the Saudi plan, calling for the recognition of Israel in the context of the 1947 United Nations resolution that endorsed the creation of both an Israeli and a Palestinian state in the area.

Klibi said the Tunisian proposal does not advocate that Israel be shrunk to the boundaries outlined in the 1947 partition plan. Rather, he said, the proposal's aim is to provide a formula for recognizing Israel while reminding the United States in particular that the right of a Palestinian state to exist has been recognized by the international community.