Steel cutting device for steel structure building

The utility model relates to the technical field of steel structure cutting, and discloses a steel cutting device for steel structure building, which comprises a base, a sawtooth frame is welded and fixed on the right side of the upper surface of the base, sawteeth are rotatably connected in the sawtooth frame, a handle is welded and fixed at the left end of the sawtooth frame, and the handle is rotatably connected with the sawtooth frame. A pedal is slidably connected to the left side of the inner wall of the base, a lower tooth row is welded and fixed to the inner bottom face of the base, an outer gear and an inner gear are engaged with the outer side and the middle of the lower tooth row correspondingly, and a fixed shaft pin is rotatably connected to the position, located below the pedal, of the inner wall of the base. A fixed sliding plate is fixedly welded to the inner wall of the base and located on the right side of the fixed shaft pin, and the upper sides of the outer gear and the inner gear are both