Double-decker wagon

A double-decker wagon, comprising four spaced rectangular standing posts, four side folding mechanisms each sequentially hinged between two adjacent standing posts, an upper bottom support mechanism, and a lower bottom support mechanism, wherein

• the four standing posts each are fixedly provided with a first fixing member, a second fixing member, and a third fixing member in sequence from top to bottom;
• and a sliding sleeve is provided in a sliding manner on the standing post between the first fixing member and the second fixing member;
• the side folding mechanism is hinged to the sliding sleeve and the first fixing member on the standing post;
• the upper bottom support mechanism is hinged to the second fixing members on the four standing posts;
• the lower bottom support mechanism is hinged to the third fixing members on the four standing posts;
• and
• the four side folding mechanisms, the upper bottom support mechanism, and the lower bottom support mechanism are collapsible.