A variable-capacity compressor, comprising: a housing; a compression mechanism disposed in the housing and comprising two bearings and a cylinder assembly disposed between the two bearings, in which the cylinder assembly comprises a first cylinder and a second cylinder, at least one of the first cylinder and the second cylinder is configured as a variable-capacity cylinder, and a compression chamber and a suction port is formed in the variable-capacity cylinder; two first suction conduits connected to the first cylinder and the second cylinder respectively; and a variable-capacity valve disposed in the compression mechanism and configured to be movable between a communication position where the compression chamber is communicated with the suction port and an isolation position where the compression chamber is isolated from the suction port, wherein the variable-capacity cylinder operates when the variable-capacity valve is located in the communication position, and the variable-capacity cylinder is unloaded when the variable-capacity valve is located in the isolation position, wherein the compression mechanism is provided with a pressure supply passage used for supplying a first pressure gas or a second pressure gas, and a pressure of the first pressure gas is greater than that of the second pressure gas; characterized in that the variable-capacity valve is provided with a first pressure passage in communication with the pressure supply passage, and when the variable-capacity valve is located in the isolation position, the pressure supply passage supplies the first pressure gas into the compression chamber through the first pressure passage. a housing; a compression mechanism disposed in the housing and comprising two bearings and a cylinder assembly disposed between the two bearings, in which the cylinder assembly comprises a first cylinder and a second cylinder, at least one of the first cylinder and the second cylinder is configured as a variable-capacity cylinder, and a compression chamber and a suction port is formed in the variable-capacity cylinder; two first suction conduits connected to the first cylinder and the second cylinder respectively; and a variable-capacity valve disposed in the compression mechanism and configured to be movable between a communication position where the compression chamber is communicated with the suction port and an isolation position where the compression chamber is isolated from the suction port, wherein the variable-capacity cylinder operates when the variable-capacity valve is located in the communication position, and the variable-capacity cylinder is unloaded when the variable-capacity valve is located in the isolation position, wherein the compression mechanism is provided with a pressure supply passage used for supplying a first pressure gas or a second pressure gas, and a pressure of the first pressure gas is greater than that of the second pressure gas; characterized in that the variable-capacity valve is provided with a first pressure passage in communication with the pressure supply passage, and when the variable-capacity valve is located in the isolation position, the pressure supply passage supplies the first pressure gas into the compression chamber through the first pressure passage.