Tension-adjustable thin film unwinding device

The utility model provides a tension-adjustable thin film unwinding device. The tension-adjustable thin film unwinding device comprises a base; the mounting seat is arranged at the top of the base; the main rotating shaft is horizontally arranged on the mounting seat in a penetrating manner, and one end of the main rotating shaft is vertically and fixedly connected with an adjusting disc; the unwinding roller is coaxially connected to the end, provided with the adjusting disc, of the main rotating shaft; the tension adjusting mechanism comprises an adjusting rod, a friction block and an air cylinder; the middle of the adjusting rod is in pivot connection with the top of the mounting base, the friction block is arranged at one end of the adjusting rod and used for being in friction with the circumferential face of the adjusting disc, the other end of the adjusting rod is hinged to one end of the air cylinder, and the other end of the air cylinder is hinged to the mounting base; the air cylinder is used for adj