Edge folding device of edge folding machine

The utility model relates to the technical field of edge folding machines, and discloses an edge folding device of an edge folding machine, which comprises a working table, the top end of the working table is fixedly connected with a fixing frame, an air cylinder is fixedly arranged at the middle position of the fixing frame in a penetrating manner, and the end face of an output shaft of the air cylinder is fixedly connected with a pressing plate. The bottom end of the pressing plate is rotationally connected with a first edge folding plate through a rotating shaft, the bottom end of the first edge folding plate is rotationally connected with a second edge folding plate through a rotating shaft, the second edge folding plate is rotationally connected with the workbench, and two lengthened screw rods are arranged at the top end of the fixing frame in a threaded and penetrating mode. According to the technical scheme, the lengthened screw rod is rotated clockwise or anticlockwise, the height of the fixing plate