The invention discloses a multi-legged robot hydraulic drive unit capable of absorbing landing impact. The multi-legged robot hydraulic drive unit comprises a proportional servo valve, a servo cylinder, an energy accumulator, a valve plate, a damping part and a fuel tank. The proportional servo valve is installed on the valve plate, four work oil ports of the proportional servo valve are connected to other components through fuel pipes respectively, the main oil inlet is connected to the energy accumulator, and the two work oil ports are connected to two cavities of the servo cylinder. A damping hole is formed between a rod-less cavity of the servo cylinder and a rod cavity of the servo cylinder. The damping part installed in the valve plate is installed in a threaded hole and can be detached and replaced, and the diameter and the length of the damping part can be adjusted according to needs. Various oil ways for hydraulic oil to flow are formed in the valve plate. The hydraulic drive unit can lower the influence of the ground impulse at the landing moment of a multi-legged robot on the high-load and high-speed gait condition on the robot, can lower the influence of instant hydraulic impact of ground impact on the hydraulic drive robot, can improve the dynamic-gait walking stability of the robot and can be applied to any joint of the multi-legged robot.