Hydraulic power system of robot

A hydraulic power system of a robot comprises the following components: a control unit ECU, a starting motor, an engine and a variable pump, wherein the starting motor, the engine and the variable pump are successively connected. An oil inlet of the variable pump is connected with an oil tank through coarse filtration. An oil outlet of the variable pump is provided with a first pressure sensor. An oil outlet of the variable pump is provided with a flow sensor through series connection, and an oil inlet end of the load is provided with a second pressure sensor through parallel connection. The first pressure sensor, the second pressure sensor and the flow sensor transmit a collected signal to the control unit ECU. The control unit ECU monitors an operation state of the power system, and simultaneously performs closed-loop control for the rotation speed of the engine and the displacement of the variable pump, thereby realizing accurate feeding of the flow and accurate control for the system pressure. Furthermore, an oil outlet of the variable pump is provided with an electric control unloading valve. The oil outlet of the variable pump is connected with an overflow valve and an energy accumulator in parallel through a check valve. The hydraulic power system of the robot can effectively utilize the energy and can accurately control the amount of supplied oil.