The invention discloses an explosion-proof magnetic chuck comprising an insulation jacket; the insulation jacket is provided with an inner chamber therein; one end of the insulation jacket is open and the other end is closed; the open end of the insulation jacket is provided with an annular sleeve; the other end of the annular sleeve is provided with a fixed magnetic steel. According to the invention, the device is installed by magnet through attraction; since static is on ferruginous objects, the overall device is fixed by means of the feature of magnetic steel, which is convenient to mount and dismount. In the invention, the conductive thimble and the conductive push rod are under the top pressure state under the action of the top tension spring; when the magnet is fixed on the iron object, the thimble will be pressed against the surface of the iron object to ensure contact with the object; the thimble has certain piercing ability and can pierce the paint or rust barrier to effectively relieve static electricity and reduce safety hazards.