The utility model discloses a dinner plate folding structure for a child dining chair. The dining chair comprises a dinner plate, front chair legs and rear chair legs, dinner plate supporting pieces are arranged on the dinner plate, front leg connecting pieces are arranged at the upper ends of the front chair legs, rear leg connecting pieces are arranged at the upper ends of the rear chair legs, and the dinner plate, the front chair legs and the rear chair legs are rotationally unfolded or rotationally folded through matching of the dinner plate supporting pieces, the front leg connecting pieces and the rear leg connecting pieces; wherein positioning blocks are arranged among the dinner plate supporting pieces, the front foot connecting pieces and the rear foot connecting pieces, and the dinner plate, the front chair legs and the rear chair legs are unfolded and positioned through the positioning blocks at least when mutually rotating and unfolding to a certain position. By means of the improvement of the structure, the folding bicycle has the advantages of being simple and reasonable in structure, excellent in performance, fast to fold, convenient to use, low in manufacturing cost, easy to produce and achieve, small in size, safe, reliable and the like, and practicability is high.