Material unloading system

The invention discloses a material unloading system which comprises a conveying device with an adjustable material conveying angle, a clamping device and a stacking device, the clamping device comprises a moving assembly for driving an object to move, a rotating assembly, a swinging assembly and a material taking assembly, the rotating assembly is rotationally connected to the moving assembly, and the swinging assembly comprises a swinging part; the swinging part is rotationally connected to the rotating assembly and can swing up and down around the rotating axis of the rotating assembly relative to the rotating assembly, an included angle exists between the rotating axis of the swinging part and the rotating axis of the rotating assembly, and the material taking assembly is connected to the swinging part and used for grabbing materials and conveying the materials to the feeding end of the conveying device; the stacking device comprises a supporting assembly and a stacking assembly, and the stacking assembly