The invention belongs to the technical field of air conditioner compressors, and particularly relates to a volume-variable air conditioner compressor. The volume-variable air conditioner compressor comprises a fixing base, a motor, an air cylinder, two pistons, an air inlet valve, an air outlet valve, a speed regulating module, an output bevel gear, a transmission module, a regulating module and extension springs; the motor is installed on the fixing base through the speed regulating module; the speed regulating module is used for regulating the transmission ratio of the motor; the output bevel gear is installed on a rotation shaft of the motor through a key; the output bevel gear meshes with the transmission module; the transmission module is installed in the middle of the air cylinder; the two pistons are symmetrically arranged in the air cylinder, and the transmission module is used for controlling the two pistons to be close to each other or far away from each other; the regulatingmodule is installed in the transmission module and used for regulating the movement stroke of the pistons; and one end of each extension spring is fixedly connected with the corresponding piston, andthe other end of each extension spring is fixedly connected to the inner wall of the air cylinder. According to the volume-variable air conditioner compressor, regulating of the compression frequencyand the compression efficiency is achieved through the regulating module and the speed regulating module, so that the volume-variable air conditioner compressor adapts to using occasions with different loads.