Combined type shelf

A combined type shelf, comprising:

• at least two double-rod frames, each of the at least two double-rod frames including two vertical post assemblies and a plurality of horizontal rods, each of the two vertical post assemblies including a first straight upright rod and a second straight upright rod parallel to each other to provide a gap for receiving therebetween ends of the plurality of horizontal rods;
• a plurality of connecting assemblies, each of the plurality of connecting assemblies including a main body, a back portion, a horizontal-rod engaging groove, a vertical-rod engaging groove and a first connecting-piece engaging cavity, the horizontal-rod engaging groove being disposed at a front side of the main body, the back portion being connected with a rear side of the main body, the first connecting-piece engaging cavity being disposed between the back portion and the main body, the vertical-rod engaging groove main body, the horizontal-rod engaging groove correspondingly matching a respectively one of the horizontal rods, at least one of the first straight upright rod and the second straight upright rod of one of the two vertical post assemblies being disposed in the vertical-rod engaging groove;
• at least one storage layer, disposed between each of the at least two double-rod frames;
• and
• a plurality of storage-layer connector structures, each of the plurality of storage-layer connector structures being disposed to the storage layer, each of the plurality of storage-layer connector structures including an inserting piece to be plugged into the first connecting-piece engaging cavity of one of the connecting assemblies to connect each of the plurality of storage-layer connector structures to the connecting assembly to assemble the storage layer to the double-rod frame.