Pressure pump refrigerating system and control method thereof

The invention discloses a pressure pump refrigerating system and a control method thereof. The pressure pump refrigerating system comprises a liquid reservoir, a pressure pump, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, wherein the pressure pump comprises a shell, a motor, a shaft, a gas compressor mechanism, a liquid transmission mechanism, a gas inlet, a gas outlet, a fluid inlet and a fluid outlet, wherein the motor, the shaft, the gas compressor mechanism and the liquid transmission mechanism area rd in the shell; the gas inlet, the gas outlet, the fluid inlet and the fluid outlet are formed in the shell; the motor drives the gas compressor mechanism and the liquid transmission mechanism to operate through the shaft; the first pipeline is connected with an outlet of the liquid reservoir and the gas inlet; the second pipeline is connected with the gas outlet and an inlet of the liquid reservoir; the third pipeline is connected with an outlet of theliquid reservoir and the