Volume-variable storage device

A storage device with the variable capacity comprises a fixed support, a U-shaped inclined hopper, a fixed plate, a movable breast board and a bottom supporting device, the U-shaped inclined hopper is fixedly installed at the upper end of the fixed support and composed of an L-shaped inclined bottom plate arranged in an inclined mode and side plates fixedly connected to the two sides of the L-shaped inclined bottom plate, and the fixed plate is fixedly connected with the L-shaped inclined bottom plate. The lowest end of an L-shaped inclined bottom plate of the U-shaped inclined hopper is matched with the bottom of the fixing plate, the two side plates are both higher than the upper end of the fixing plate, and the highest position of the L-shaped inclined bottom plate is flush with the highest positions of the side plates. The movable breast board is movably installed in a gap formed between the U-shaped inclined hopper and the fixed plate, and the bottom of the movable breast board is connected with a first