The present invention relates to a magneto-optical sewage treatment apparatus, and belongs to the field of sewage treatment equipment. The apparatus comprises a housing, a water inlet, an agent addition port, a static pipeline mixer, a motor, a stirring paddle, an ultraviolet lamp, a magnetic field, an effluent baffle, a water outlet, a mud discharging pipe, a control valve, a magnetic separator, a control valve, a mud outlet, a magnetic flocculant reflux pump, a conveying pipe, a control valve and a three-way pipe. According to the present invention, based on a combination effect of photocatalysis and magnetic flocculation of a magneto-optical catalysis material, under a controlled magnetic field effect, one part of polluting substances in sewage is degraded through photocatalysis, the other part of polluting substances in sewage forms a magnetic floc, and the magnetic floc is subjected to rapid sedimentation removal so as to achieve a sewage purification effect; a magnetic separation device and a conveying device are adopted to achieve separation and recovery utilization of the magneto-optical catalysis material and the magnetic flocculant; and with the magneto-optical sewage treatment apparatus, photocatalysis, flocculation, precipitation and magneto-optical catalysis material recovery utilization are integrated, and characteristics of simple structure, convenient operation, significant treatment and small occupation area are provided.