Automatic opening device for sulfur paper of special-shaped prefabricated carton

The utility model provides an automatic opening device for sulfur paper of a special-shaped prefabricated carton. The automatic opening device comprises an air tap, an electromagnetic valve, a first photoelectric switch and a controller, the first photoelectric switch is arranged at a preset position on the conveying belt so as to detect whether the special-shaped prefabricated strip box reaches an automatic opening work station or not; the air tap is arranged at an automatic opening operation station and is communicated with an external compressed air source through an air pipe, and the air pipe is provided with the electromagnetic valve; the controller is in signal connection with the first photoelectric switch and the electromagnetic valve, and the controller controls the electromagnetic valve to be switched on when the special-shaped prefabricated strip box reaches an automatic opening work station, so that the air tap blows air to the special-shaped prefabricated strip box, a box cover and a movable edge