Automatic tray feeding and discharging machine

The utility model discloses an automatic tray feeding and discharging machine, which comprises a conveyor belt, a stock bin, an inserting plate assembly and a lifting assembly which are arranged on a working table, the stock bin is arranged above the conveyor belt, the inserting plate assembly is arranged on two sides of the bottom of the stock bin, and the lifting assembly comprises a first air cylinder, a second air cylinder, an upper floating plate and a lower floating plate. The first air cylinder is fixed to the workbench, the end of a first telescopic shaft of the first air cylinder is fixedly connected with the lower floating plate, the second air cylinder is arranged on the lower floating plate, and the end of a second telescopic shaft of the second air cylinder is fixedly connected with the upper floating plate. A first guide assembly is arranged between the lower floating plate and the workbench, and a second guide assembly is arranged between the upper floating plate and the lower floating plate. A