Screen printing machine

The utility model relates to a screen printing machine. The screen printing machine comprises a machine body. The top face of the machine body is provided with a carrying platform. The side face of the top of the machine body is provided with a vertical frame. The side face of the vertical frame is provided with a lifting sliding rail which is matched with a lifting plate. A main lifting air cylinder is arranged on the machine body. The lifting plate is provided with transverse sliding rails matched with a machine head. The two ends of the lifting plate are provided with transverse moving belt gears. A synchronous toothed belt connected with the machine head is connected between the transverse moving belt gears. The lifting plate is provided with a transverse moving motor. The machine head is provided with two acting air cylinders, one acting air cylinder is connected with a paint coating scraper, and the other acting air cylinder is connected with a paint return scraper. The two ends of the lifting plate are provided with locating sensors. According to the screen printing machine, the main lifting air cylinder is used for controlling wide-range ascending and descending of the machine head, and PCBs can be withdrawn conveniently; the PCBs can be placed conveniently, the plate placing time is shortened, the working efficiency is improved, the acting air cylinders independent of each other can control the paint coating scraper and the paint return scraper to work conveniently, paint liquid can be saved, automatic paint coating is achieved through the locating sensors, and the production efficiency is improved.