The invention discloses a fireproof door magnet switch. The fireproof door magnet switch comprises a door magnet body assembly, a right door magnet lock body assembly, a left door magnet lock body assembly, a body drive motor, a body main gear, a body transmission gear, a radial bevel gear, an axial bevel gear, a transmission hexagon, a transmission connecting rod, a lock catch, spring bolts, driving cams, driving cranks, driven cams, driven cranks, pushing sliding blocks, following wheels, lock body motors, gear supporting shafts, lock body main gears, gear locking screws, lock body driven gears and gear transmission shafts. The door magnet body assembly is fixed to a fireproof door frame. The right door magnet lock body assembly and the left door magnet lock body assembly are symmetrically fixed to a door leaf. In the left door magnet lock body assembly and the right door magnet lock body assembly, the lock body motors are used for driving matched transmission of gears and crank cammechanisms, the spring bolts fixed in the pushing sliding blocks are driven to move front and back to be matched with the lock catch in the door magnet body assembly fixed to the fireproof door frame,and door leaf locking, opening and closing are achieved.