Liquid piston compressor with oil-supplementing slippage pump and high-speed switch valve

A liquid piston compressor with an oil-supplementing slippage pump 42 and a high-speed switch valve 36, comprising a drive plunger pump 2, a compression unit 1 and a controller. The compression unit comprises, a booster cylinder 5 with a piston assembly 11 and a compression cavity 12 and a hydraulic cavity 13, wherein a displacement sensor 18 is arranged in the compression cavity. An oil port of the hydraulic cavity is divided into one path connected with the drive plunger pump through a second one-way valve 38, and another path sequentially connected with the high-speed switch valve and an oil tank 43. The drive plunger pump is further connected with the oil tank through a third one-way valve 39 and the slippage pump. The controller determined whether the piston assembly is in the upper limit position or a descending state using the sensor, and if yes, the high-speed switch valve is opened. The hydraulic cavity may be divided into two cavities 30, 31 by a buffer groove disc (fig.2, 27) that may comprise a through hole 29 that matches with a buffer shaft 19 of the booster cylinder.