Large-displacement built-in automatic reverse hydraulic plunger pump

A large-displacement built-in automatic reverse hydraulic plunger pump comprises a hydraulic plunger fuel pump and a hydraulic power control system. A supporting column is fixed in the middle of a cylindrical housing of the hydraulic plunger fuel pump. A reversing device is arranged in the supporting column. An oil inlet and an oil outlet are formed in a housing of the reversing device. Two oil passages which are respectively communicated with oil cavities formed in two sides of the supporting column are arranged in the reversing device. A connecting rod is arranged at the center of the supporting column. Pistons are arranged at two ends of the connecting rod, and the front ends of the pistons are fixed with plungers. Water inlets and water outlets are formed in a cavity formed in the front portions of plunger covers. One-way inlet valves and one-way outlet valves are arranged on pipelines which are connected with the water inlets and the water outlets in an outer mode. A high-pressure oil inlet tube of the hydraulic power control system is connected with the oil inlet of the reversing device, and a low-pressure oil return tube of the hydraulic power control system is connected with the oil outlet of the reversing device. The hydraulic plunger fuel pump enables the connecting rod to do reciprocating motion trough the reversing device and has the advantages of being stable in operation, small in vibration, strong in suction capacity, large in displacement, high in pressure resistance, long in working running time, few in quick-wear part, long in service life, good in energy-saving effect and the like.