Supporting and fixing device for printed matter printing

The utility model discloses a supporting and fixing device for printed matter printing, which comprises a fixing plate, an adjusting groove is arranged in the fixing plate, a lifting plate is slidably connected in the adjusting groove, a hydraulic lifting cylinder is fixedly connected below the lifting plate in the adjusting groove, and the output end of the hydraulic lifting cylinder is fixedly connected to the bottom end of the lifting plate. A pair of threaded rods are rotationally connected between the supporting plate and the lifting plate, moving blocks are in threaded connection with the outer walls of the threaded rods, a pair of sliding rods are slidably connected to the top end of the fixing plate, the bottom ends of the sliding rods penetrate through the fixing plate and are fixedly connected to the top ends of the moving blocks, and rolling wheels are rotationally connected to the sides, close to each other, of the top ends of the sliding rods; the paper flattening device has the advantages that t