The invention discloses a scroll compressor. The scroll compressor comprises a fixed scroll part and a movable scroll part which are engaged; and a first air suction opening, a second air suction opening, a first exhaust opening and a second exhaust opening are limited by the fixed scroll part, a first compression path is formed between the first air suction opening and the first exhaust opening,a second compression path is formed between the second air suction opening and the second exhaust opening, the compressor further comprises a bypass channel enabling at least one of the first compression path and the second compression path to be bypassed to the air suction pressure area of the compressor, the bypass channel can selectively provide communication and communication failure, a firstbackpressure cavity and a second backpressure cavity are formed on the side, back to the movable scroll part, of the fixed scroll part, the first backpressure cavity communicates with the first compression path through a first backpressure channel, and the second backpressure cavity communicates with a second compression path through the second backpressure channel.