Magnetic　separation　technology　is　a　physical　separation　method　that　uses　the　differences　in　magnetism　between　matter　to　separate　them　from　each　other　by　different　motion　behaviors　in　a　non-uniform　magnetic　field.　It　is　highly　efficient,　green,　and　environmentally　friendly,　with　little　change　in　the　physical　and　chemical　properties　of　raw　materials.　Magnetic　separation　technology　is　commonly　used　in　the　field　of　mineral　processing　engineering　for　magnetite,　hematite,　titanite,　and　other　magnetic　ferrous　metal　oxide　minerals.　This　paper　summarizes　the　application　of　magnetic　separation　technology　for　resource　utilization　and　environmental　treatment　in　different　fields,　such　as　non-metal　decomposition,　valuable　metal　recovery,　use　of　magnetic　carrier　chemical　separation,　biomedical　targeted　magnetic　separation,　and　use　of　magnetic　species　separation　in　water　and　wastewater　treatment.　We　seek　to　review　the　application　and　potential　of　magnetic　separation　technology　in　various　fields,　emphasize　their　key　role,　and　explore　possible　directions　for　their　future　development.