Open mill start-stop control system and control method

The invention relates to an open mill start-stop control system and a control method. The open mill start-stop control system comprises a plurality of open mills connected in sequence, a film cooling line and a photoelectric detection device, a rubber material is sequentially conveyed to the last open mill from the first open mill, the last open mill conveys the rubber material to a receiving conveying belt of the rubber sheet cooling line, each open mill is provided with a roller, and the rollers are used for conveying the rubber material; the photoelectric detection device is arranged on the last open mill and is used for starting and stopping the last open mill according to the detected rubber material conveying condition on the last open mill. According to the invention, the operation frequency of manually stopping the open mill for avoiding emptying of the rubber material before a new train of rubber material reaches the open mill by an operator can be reduced, and the labor cost is reduced; and the prob