Mezzanine storage shelves use shelf columns as floor support, steel structure floor, flat floor, strong integrity, strong and uniform bearing capacity, low cost, fast construction, suitable for warehouses with high height, small goods, manual storage and retrieval, large storage and retrieval volume, and can make full use of and save warehouse area. According to the actual site and specific requirements, it can be designed into multiple floors, usually 2 to 3 floors, and the bottom shelves can use medium-sized shelves, heavy-duty shelves and other shelves.