Child trailer with low folding thickness

A child trailer with a low folding thickness, comprising a bottom frame and a side frame, wherein a front end of the bottom frame is rotationally connected with a front end of the side frame;

• a top support rod is fixed at a rear end of the side frame;
• a left end and a right end of the top support rod are respectively connected with an upper-section tail support rod rotating around an axis of the top support rod;
• a tail end of the upper-section tail support rod is connected with a first end of a folding joint;
• a second end of the folding joint is connected with a lower-section tail support rod;
• a rear end of the bottom frame is connected with a tail rack rotating around a shaft parallel to the axis of the top support rod;
• and a tail end of the lower-section tail support rod is rotationally connected with a middle part of the tail rack;
• a folding locking member matched with the tail rack is fixed on the lower-section tail support rod or the upper-section tail support rod;
• and
• rear wheels are mounted on a rear side of the bottom frame, and a towing rod device extending forward is fixed at a bottom of a front side of the bottom frame,
• wherein the folding joint comprises a first rotating block, a second rotating block and a rotating piece;
• the first rotating block is fixedly connected with an upper connecting part;
• the upper connecting part is fixed to the upper-section tail support rod;
• the second rotating block is fixedly connected with a lower connecting part;
• the lower connecting part is fixed to the lower-section tail support rod;
• the rotating piece is located on a rear side of the first rotating block and a rear side of the second rotating block;
• two ends of the rotating piece are respectively hinged at a middle part of the first rotating block and a middle part of the second rotating block;
• and rotating piece grooves matched with the rotating piece are respectively formed on the rear side of the first rotating block and the rear side of the second rotating block;
• and
• wherein an upper part of the tail rack is provided with two U-shaped bending parts;
• a middle part of each U-shaped bending part protrudes toward a rear side of the child trailer, an included angle of each U-shaped bending part is between 100° and 110°, and when the child trailer is unfolded, the tail rack is attached to the upper-section tail support rod, the folding joint and the lower-section tail support rod.