Compressor with low backpressure

The utility model discloses a compressor with low backpressure. The compressor comprises a casing and a compression mechanism. The compression mechanism is provided with two air exhaust cavities which comprise a first air exhaust cavity and a second air exhaust cavity communicated with the first air exhaust cavity, the compression mechanism comprises a cylinder assemblyand two bearings, the cylinder assembly comprises at least one cylinder, and a gliding slab cavity is arranged in each cylinder. The two bearings comprise a main bearing and an auxiliary bearing, an air exhaust partition board is arranged between at least one bearing and the cylinder assembly, and at least one of the first air exhaust cavity and the second air exhaust cavity is formed by the air exhaust partition board and the corresponding bearing. The air exhaust cavities of the compressor and the air exhaust partition board can be simplified, sealed surfaces of the air exhaust cavities are simple planes which are mechanically sealed, the cost is low, the reliability is high, the problems of too complicated part structures, high difficulty in process and high production cost of a compressor with low backpressure are solved, and the reliability of the compressor is improved.