The present invention discloses a structure used for reducing suction gas noises and used in a rotation-type compressor, wherein one narrow groove is formed at air cylinder walls of an air cylinder, and both terminals of the narrow groove are connected respectively wit an air cylinder baffle plate groove and an air cylinder gas inhaling hole. The beneficial effects are as follows: by adopting the narrow groove used for keeping the connection between the gas inhaling hole and the air cylinder baffle plate all the time, during the compressor's operation course, a vacuum cavity among the three parts (the upper rolling hoop 9, the baffle plate 7 and air cylinder 10) will not appear at any position, and then the gas inhaling noises generated at the moment the vacuum cavity and the air entry are connected is eliminated. |