The invention discloses a direct current self-reset electromagnet, and relates to the technical field of electromagnets. The direct current self-reset electromagnet comprises a housing and photoelectric sensors, an electromagnet body, a moving iron core and a displacement detecting plate, wherein the photoelectric sensors, the electromagnet body, the moving iron core and the displacement detecting plate are installed in the housing; the moving iron core is installed in an axle hole of the electromagnet body in a sleeving mode; one end of the moving iron core is connected to the displacement detecting plate, and the other end of the moving iron core is connected to a wear-resistant lock core; a reset spring is arranged between the moving iron core and the electromagnet body; one side of the electromagnet body is further provided with two opposite photoelectric sensors; photoelectric sensors at different positions are coordinated with the displacement detecting plate at different times and senses relative positions of the displacement detecting plate. The direct current self-reset electromagnet mainly adopts modularized design, shortens response time of sensing equipment, improves the sensing device, and can drastically improve the reliability of sensing by utilizing photoelectric sensor control.