The invention discloses a capacity-expandable cargo turnover box with two kinds of plates capable of being disassembled and restored. The capacity-expandable cargo turnover box is an express deliveryturnover box which can be disassembled and reassembled. The capacity-expandable cargo turnover box is characterized in that the express delivery turnover box with an internal space capable of be expanded is formed simply by the two kinds of plates, namely, splicing side plates and upper and lower cover plates; and the size relation between each upper and lower cover plate and the structural components of each splicing side plate is as follows: a is equal to b+c+c/2, wherein a is the side length of each upper and lower cover plate, b is the main body length of each splicing side plate, c is thewidth of each single-slide long and short dual-purpose tenon bar edge, and c/2 is the depth of each shallow mortise groove, so that the turnover box can be longitudinally and transversely expanded tobe the turnover box having the large internal space. The capacity-expandable cargo turnover box has the advantages that the turnover box can be spliced simply by using the two kinds of plates, the turnover box is very suitable for the express delivery industry to rapidly splice the plates into the turnover box for use and to simply disassemble the turnover box into the two kinds of plates to be recycled, packaging pollution and waste in express delivery are reduced substantially, the turnover box can be expanded horizontally and be expanded in a multilayer manner to form an expandable turnover box with the large internal space and without internal partition plates.