Anti-toppling device of tunnel protective door

The utility model discloses an anti-toppling device of a tunnel protective door, the anti-toppling device of the tunnel protective door comprises a tunnel wall body, the two sides and the top wall of the tunnel wall body are fixedly connected with a plurality of fixing assemblies, each fixing assembly comprises a fixing bolt, a first fixing block, a connecting rod, a second fixing block and a threaded hole, one end of the fixing assembly is fixedly connected with a mounting frame, one side of the mounting frame is rotatably connected with an anti-toppling door, the inner wall of the anti-toppling door is fixedly connected with a plurality of cross beams and vertical beams, a door frame is mounted in the tunnel wall, and part of the outer side wall of the door frame is fixedly connected with the inner wall of the mounting frame. And one side of the door frame is rotationally connected with a protective door. By arranging the fixing assembly, the mounting frame and the anti-toppling door, the strength of the si