In order to study the energy recovery efficiency of seawater desalination,AMESim software was used to simulate the overall hydraulic system of the motor pump motor,and the flow characteristics and energy recovery rate of the motor pump motor at different speeds were studied.In order to verify the accuracy of the simulation results,the test bench of motor pump motor was established,and the test results were compared with the simulation results.The results show that in the case of producing the same output of fresh water,the device with motor energy recovery has a very obvious energy-saving effect compared with the device without motor power recovery,and the appropriate increase in speed can increase the energy-saving effect.The flow test results of the pump side and the motor side are lower than the simulation results,which is due to the more leakage generated during the test process.However,with the increase of motor speed,the difference between the flow rate on the pump side gradually increases,while the flow difference on the motor side gradually decreases.Under the rated speed of 1 500 r/min,the energy efficiency utilization rate of the motor energy recovery device reaches more than 95%.