Aiming at the energy consumption of ultrafiltration circulating pump in landfill leachate treatment，this paper designs a method and system to reduce the energy consumption of ultrafiltration circulating pump. The system adopts the B/S architecture and combines the optimal algorithm model trained by the neural network to adjust the operating parameters of the ultrafiltration circulating pump in advance，thereby saving energy and reducing consumption. The front-end display part uses Jquery+Bootstrap+Highcharts+ACE framework，the back-end service part adopts Spring+SpringBoot+MyBatis framework，and the front and back ends interact through Json data format. After the online test and on-site trial operation，the system has been officially put into use and achieved good results.