Italian Communist party today attacked the Carter administration for "open and coarse intereference" in Italy's internal affairs.

Reacting to a U.S. warning yesterday against Communist participation in any Western European government, the Italian Communist daily Unita charged that President Carter was attempting "to influence the political situation of our country" during the current crisis, which is expected to lead to the resignation of Premier Giulio Andreottti's Christian Democratic minority government.

The U.S. warning - the sharpest made by the Carter administration on the problems confronting the Western alliance by the increasing influence of Western European Communist parties - was specifically designed to prevent Communist entry into a new Italian government.

The front-page Unita article pointed out that the American policy statement was in conflict with Carter's avowed policy of non-interference. Later today, a ranking Communist official, Giancarlo Jajetta, termed the U.S. statement as "grotesque" and as part of an American policy of "limited sovereigbty" for West European nations.

Communist criticism was echoed by the smaller Socialist Party, which issued a statement saying that the U.S. declaration that followed Ambassador Richard Gardner's recall this week for consultations represented a case of 'outright interference which would only be used by those eager to dramatize the current Italian situation."

A leftwing Christian Democrat, Carlo Fracanzani, also criticized the American government for a "grave and inadmissable interference in our affairs."

Ambassador Gardner returned here today and was expected to meet Andreotti in the next few days. Gardner made only a brief statement indicating he had no formal U.S. government message for Andreotti.

Meanwhile, Andreotti has scheduled formal consultations Saturday with parliamentary groups, including the five parties whose abstentions have permitted him to govern for the past 18 months.

The Communists, Socialists and Republicans already have announced that they are withdrawing support for continuation of the government and that they favor a national emergency government. The Communist Party, the nation's second largest, would presumably share ministerial positions in such an emergency government and direct government responsibility for the first time in 31 years.