As a new water treatment technology，the super-magnetic separation and water purification technology has developed rapidly worldwide in recent years，and it is widely studied and applied in engineering. Taking the third phase of the ecological desilting project in Lake Baiyangdian as an example，this study focuses on expounding on the technical characteristics and process flow of the super-magnetic separation and water purification technology considering the engineering problems such as the massive volume of water to be treated，a short cycle，and limited land occupation. In addition，the application effect of the technology in the treatment of polluted water is obtained. The research results can provide experience and references for the treatment of polluted water in similar projects.