Automatic sterilizer for films

The invention discloses an automatic sterilizer for films. The sterilizer comprises a first mounting box, a second mounting box and a transparent film for covering the surface of an elevator key panel, the first mounting box and the second mounting box are installed on the two sides of the elevator key panel respectively, the first mounting box is provided with a first rotating shaft in winding connection with one end of the transparent film, the second mounting box is provided with a second rotating shaft in winding connection with the other end of the transparent film, the first mounting boxor the second mounting box is provided with a disinfectant adsorption piece in contact with the transparent film, the first rotating shaft is connected to a motor capable of driving the first rotating shaft to rotate and wind the transparent film to move in the first direction, the motor is electrically connected to a control device controlling the motor to be powered on/off regularly, and the second rotating shaft is co