There are multiple layers trolley connected with the front and rear beam in the push back rack. The material box or pallet is put on the trolley from outside, and the subsequent material box will push the prior inside. The trolley crosses the leaning track.When the outboard material is taken, the inside trolley will slide down automatically. This push back rack can storage much material with high space occupation rate, which is suitable for few type while large quantity goods. The operation method is first-in-last-out. The in and out are in the same side.