Polish Foreign Minister Jozef Czyrek arrived here today on an official visit that is expected to focus on consultations with Kremlin leaders. He is the first senior Polish political figure known to have visited here since the military crackdown in his homeland.

Diplomatic observers here said the trip, coupled with the easing of martial-law restrictions in Poland, seemed to be an effort to demonstrate a gradual restoration of normal conditions in the country.

East European sources said Czyrek's visit also could be interpreted as reflecting the need to coordinate policies between Moscow and Warsaw in the face of continued Western criticism and President Reagan's economic sanctions.

The Polish official arrived here on the eve of a NATO foreign ministers' meeting in Brussels that is expected to blame the Kremlin for the Polish military crackdown and consider American insistence on allied sanctions.

The Soviets repeatedly have denounced the Reagan administration for allegedly seeking to use Poland to increase international tensions. Moscow has warned that it would take retaliatory action against those NATO countries that "succumb" to U.S. pressure for economic sanctions.

An authoritative Kremlin commentary today, however, clearly stated that Moscow was interested in the lowering of the international temperature. While repeating its standard denunciation of the Reagan administration, the commentary asserted that "life calls for reasonable negotiations and cooperation.

"Depriving others of calm and secure life, the United States denies itself the same. The future of the American people is as inseparably linked with the preservation of peace as is the future of other peoples."

The commentary in the Communist Party newspaper Pravda was signed by A. Petrov, a pseudonym used for high-level Kremlin assessments.

It was not known which side initiated Czyrek's visit, but it is expected that the Polish official will publicly rebuff the Western contention that Moscow, rather than the Polish leadership, was responsible for the military crackdown.

Czyrek was met today by Soviet Foreign Minister Andrei Gromyko. The government newspaper Izvestia said his visit was expected to promote "the further strengthening of relations of friendship and all-round cooperation" between the two countries.

As a career diplomat--he has held a variety of positions since 1952 before becoming deputy foreign minister in 1971 and foreign minister in August 1980--Czyrek was expected to discuss international aspects of the Polish crisis.

He also became a full member of the ruling Polish Politburo last year, and as such is in a position to provide the Soviets with an assessment of internal Polish developments since the imposition of martial law Dec. 13.

East Europeans, including Polish sources here, believe that the martial-law government of Gen. Wojciech Jaruzelski successfully has completed the first critical phase of bringing the country under control.

Jaruzelski's government is now seen as facing the second and equally critical stage of renewing a dialogue with the Polish workers and the powerful Roman Catholic Church.

To do that, the Polish leader will have to set a realistic framework acceptable to the party, the church, the workers and the Kremlin. It is believed here that Czyrek will meet here with top leaders to discuss these issues as well.

While they have sought to avoid any impression of interferring in Polish affairs, the Soviets have made it abundantly clear that they would like to see the Polish Communist Party regenerate itself, assume its leading role and take back the reins of power from the armed forces.