The utility model relates to the technical field of child chairs, in particular to a child chair convenient to disassemble and assemble. The child chair convenient to disassemble and assemble comprises a seat body and a supporting frame, two sets of chair legs are evenly arranged at the bottom of the seat body, a containing groove is formed in the rear side of the bottom of the seat body, two sets of first inserting grooves are evenly formed in the front side of the seat body, second limiting blocks are inserted into the first inserting grooves, and the second limiting blocks are inserted into the second inserting grooves. A dinner plate is arranged on the front sides of the two sets of second limiting blocks, the dinner plate and the second limiting blocks correspond to the storage grooves, the supporting frame is located on the outer side of the seat, and the left side and the right side of the seat are each provided with a set of first limiting blocks. According to the technical scheme, the device can be quickly switched and transformed among a dining chair mode, a push chair mode and a seat mode, so that the device has the functions of a child seat, a child dining chair and a child push chair at the same time, the child rearing cost can be effectively reduced, and the economic burden of families with children is relieved.