The invention discloses a connecting piece, a box body and a refrigerator. The connecting piece is used for the refrigerator, and comprises a connecting main body, at least one groove structure, and first limiting parts. The at least one groove structure is arranged at an end part of the connecting main body and is used for dividing the connection main body into a plurality of support legs; the first limiting parts are arranged at the end parts of the support legs and extend out of the side wall of the connecting main body in the radial direction of the connecting main body; and a gap is reserved between the support legs positioned at the same end part of the connecting main body. According to the connecting piece disclosed by the invention, one end of each support leg penetrates through two stacking parts with through holes, the first limiting parts contact edges of the through holes, so that the support legs are stressed to cause elastic deformation towards the groove structure, the first limiting parts can successfully pass through the through holes, and the support legs are not affected by external force any more after the first limiting parts pass through the through holes and recovers to the state before the elastic deformation, and separation of two parts is limited and the connection is realized. The connecting piece is simple to operate, and is simple and convenient in mounting process; moreover, the production efficiency is improved.