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 (B) and a suction port (A) 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 (B) is communicated with the suction port (A) and an isolation position where the compression chamber (B) is isolated from the suction port (A), 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 (E) 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 (B) through the first pressure passage (E). 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 (B) and a suction port (A) 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 (B) is communicated with the suction port (A) and an isolation position where the compression chamber (B) is isolated from the suction port (A), 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 (E) 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 (B) through the first pressure passage (E). <EOS>