The invention relates to a jig for pasting a film cutting piece and belongs to the technical field of jigs. The jig comprises a bottom board, sliding rails, a machining roller and a locating frame used for containing a piece to be machined and the film cutting piece. The sliding rails and the machining roller are both installed on the bottom board. The axis of the machining roller is perpendicular to the length direction of the sliding rails. The locating frame is installed on the bottom board in a sliding manner through the sliding rails. A first machining groove is formed in the middle of the locating frame. The machining roller is located in the first machining groove. By the adoption of the jig for pasting the film cutting piece, the film cutting piece is gradually bonded to the piece to be machined through the machining roller, and meanwhile bubbles between the film cutting piece and the piece to be machined are further eliminated, so that the jig has the bubble eliminating function, manual operation is avoided, and the quality of a finished product is improved.