Longspan shelf is a light/medium-sized storage rack. It is a combined structure, and the floor height can be adjusted and increased or decreased at will. The shelf can be made of steel shelf or wooden shelf, and each layer can bear 100-700 kg. It is suitable for all kinds of small and medium-sized warehouses, with a small amount but a large variety. It is a shelf for high frequency of entering and leaving the warehouse, which store of goods.