The invention provides a rotary compressor. The rotary compressor comprises a cylinder body and a rotating shaft, wherein the rotating shaft is a coaxial shaft; a cylinder body is provided with a cylinder body cavity; the cylinder body cavity is eccentrically arranged relative to the rotating shaft; and a crescent working cavity is formed between an inner peripheral wall of the cylinder body cavity and an outer peripheral wall of the rotating shaft. According to the rotary compressor disclosed by the invention, the rotating shaft is the coaxial shaft, and the cylinder body cavity is eccentrically arranged relative to the rotating shaft, so that the crescent working cavity is formed between the inner peripheral wall of the cylinder body cavity and the outer peripheral wall of the rotating shaft, and namely that in the working process of removing an eccentric part of a rotor, performing rotation and performing compression, the eccentric force is eliminated, so that the operation of a pump body can be relatively smooth, and noises of the compressor can be effectively reduced.