The embodiment of the utility model provides a connecting structure of a plastic model, which comprises a plastic body, a fixing plate and a connecting piece, the plastic body is provided with a containing groove, the fixing plate is arranged in the containing groove, one end of the connecting piece is inserted into and penetrates through the fixing plate, and the other end of the connecting piece is connected with a support frame. The fixing plate is installed in the containing groove in the plastic body, then the connecting piece is inserted into the fixing plate, then the connecting piece is installed and fixed through the fixing plate, when the model support is inserted into the connecting piece to be fixed, the use purpose is achieved, the fixing plate serves as a stress part of a connecting support, and even if the model support is transported or moved, the fixing plate can be used for fixing the model support. And when the connecting part of the bracket is broken due to collision, only the fixing plate needs to be replaced, so that the service life of the plastic model is prolonged, and the loss is reduced.