Hydraulic-drive LNG pump system

The utility model discloses a hydraulic-drive LNG pump system. The hydraulic-drive LNG pump system comprises a controller, a motor, a hydraulic pump, a hydraulic motor, a low-temperature pump and a hydraulic oil tank, wherein the hydraulic pump, the hydraulic motor and the hydraulic oil tank form oilway circulation, the oil outlet end of the hydraulic pump is connected with the oil inlet end of the hydraulic motor, the oil inlet end of the hydraulic pump and the oil outlet end of the hydraulic motor are respectively connected with the hydraulic oil tank, the output end of the controller is connected with the motor, the output shaft end of the motor is connected with the hydraulic pump, the oil outlet end of the hydraulic pump is connected with the hydraulic motor, the output shaft end of the hydraulic motor is connected with the low-temperature pump, and the oil inlet end of the low-temperature pump is connected with an LNG storage tank. The hydraulic-drive LNG pump system that the pump needs not to be soaked into low-temperature LNG, precooling is not needed, a pump pond is not needed, operation space is saved, and convenience in maintenance is achieved.