The invention discloses a super-magnetic separation device for sewage treatment, wherein a magnetic powder dispenser is arranged on a coagulation reaction tank, micro-magnetic flocs are added into thecoagulation reaction tank by the magnetic powder dispenser, a stirrer is arranged in the coagulation reaction tank, a glassy sleeve sleeves outside a magnetic disk of a super-magnetic rotating drum in a super-magnetic separation tank, and a brush is tangent to the outer cylindrical surface of the glassy sleeve; a material brushed by the brush enters a V-shaped groove, and a discharge assisting jet nozzle flushes the material to the groove bottom of the V-shaped groove. In a magnetic seed recovery groove, a radiation magnetic core of a magnetic turntable is arranged on a magnetic drum of the axial center at a radiation angle to form an intermittent magnetic field. A glassy isolation sleeve sleeves outside the radiation magnetic core. A scraper is close to the outer cylindrical surface of the isolation sleeve. Magnetic seeds scraped by the scraper are configured by a magnetic seed adjuster and then flow back into the coagulation reaction tank. Through the super-magnetic separation device, the magnetic seeds can be completely and rapidly stripped, and cleaner magnetic powder can be recycled.