Tray stacking device

The utility model relates to the field of conveying and stacking, in particular to a tray stacking device which comprises a clamping seat, two clamping arms and a clamping driving device. Each clamping arm comprises an arm body, hook plates, an adjusting base, a sliding air cylinder arranged on the arm body and used for driving the adjusting base to move up and down, adjusting air cylinders arranged at the two ends of the adjusting base and used for adjusting the tray, and adjusting plates arranged on piston rods of the adjusting air cylinders. The arm main body is provided with a horizontal limiting part for limiting rotation of the hook plates and a vertical inclined part for limiting rotation of the hook plates, the clamping movement direction of the two adjusting plates is perpendicular to the clamping movement direction of the two clamping arms, the initial positions of the hook plates on the two clamping arms are horizontal positions, and the initial positions of the hook plates on the two clamping arms