Aiming at the limited efficiency of a single accumulator recovering potential energy in the process of the excavator boom falling,an energy recovery strategy of high and low pressure double accumulator switching was proposed.Based on the principle of energy recovery,the 3D simulation model and hydraulic system simulation model were established by using the computer simulation software SimulitionX according to the 3D structure model of the working device.On this basis,the influence of excavator working device posture on boom potential energy recovery efficiency was studied,and the boom expansion process under different operation modes with different accumulator pressures was simulated and analyzed.Finally,the operation of excavator in a certain period of time was investigated and analyzed.The results show that in this operation condition,the efficiency of energy recovery by switching between 3 MPa and 5 MPa high and low pressure double accumulators is 29.23% higher than that of 3 MPa low pressure accumulators,and 9.06% higher than that of 5 MPa high pressure accumulators.