Abstract: In response to the installation and use of electrolytic domestic sewage treatment equipment on the 115FPSO crude oil production facility of CNOOC Shenzhen Branch, serious scaling and difficulty in cleaning inside the electrode plate are prone to occur during use, resulting in a high failure rate of the electrode plate. This article designs an intelligent algorithm based system that can monitor the thickness of scale inside the electrode plate online and perform intelligent cyclic cleaning of the electrode plate. By analysing the actual operating conditions and operational requirements of offshore oil and gas field production facilities, and taking into account the characteristics of electrolytic domestic wastewater treatment technology, a human-machine interface system has been developed that is capable of monitoring the internal thickness of electrode plates in real time and issuing alarm notifications. This system is integrated with an automatic circulation cleaning device for the electrode plates. The device has been successfully applied on site, achieving online monitoring of electrode plate thickness. When cleaning the electrode plate, the operation time has been shortened from 32 h/time to 8 h/time, the cleaning efficiency has been improved by 80%, and the energy consumption has been reduced by more than 60%, significantly improving the reliability of the sewage treatment system. Extend the service life of electrodes, reduce equipment failures, and lower equipment maintenance costs. The COD level of the treated domestic wastewater has been reduced to 210 mg/L, complying with the GB 4914-2008 discharge standard, and providing an innovative solution for upgrading environmental protection equipment on offshore platforms.