Concave square tube storage shelf

A concave square tube storage shelf, comprising:

• a plurality of post components, each comprising a concave square tube and at least one inclined hole group, wherein each of the concave square tubes comprises a first plate, a second plate, a third plate, and at least one concave plate, each of the second plates and the corresponding third plate are parallel to each other, each of the first plates and the at least one concave plate are opposite sides, two sides of each of the first plates are respectively connected to the corresponding second plate and the corresponding third plate, two sides of each of the concave plates are respectively connected to the corresponding second plate and the corresponding third plate, the at least one concave plate is provided with the at least one inclined hole group, each of the inclined hole groups comprises a first group of inclined holes and a second group of inclined holes, each of the first group of inclined holes and the corresponding second group of inclined holes are arranged side by side through the corresponding concave plate, and each of the first group of inclined holes and each of the second group of inclined holes are respectively provided with two inclined holes along an assembly direction;
• a plurality of storage layers, each comprising a shelf rack and a plurality of fasteners, wherein the fasteners are arranged on left and right sides of the shelf rack, and the fasteners are respectively fastened to the corresponding inclined holes to fix the storage layers between the post components;
• and
• a plurality of shelf boards, respectively arranged on the corresponding storage layer.