The invention comprises simple binding jig. The simple binding jig is used for combining a plurality of files to be bound with a plurality of binding pieces. The binding piece is provided with an inner circular plate, and outer convex rings surrounding the periphery of the inner circular plate. The simple binding jig comprises an auxiliary plate, the auxiliary plate comprises a plate body and clamping holes penetrating through the plate body. The clamping holes are provided with large-diameter hole parts which are separated from each other, and small-diameter hole parts communicated with the large-diameter hole parts. The large-diameter hole parts are matched with the small-diameter hole parts to form pressing sheets which are separated from each other. The binding pieces are placed in theclamping holes, and the outer convex rings can be blocked and pressed through the pressing pieces. Therefore, a right quantity and a plurality of specifications of the binding pieces are placed in corresponding clamping holes according to requirements by a user, and then the to-be-bound files are combined with the binding pieces, and then the binding pieces are pulled out of the clamping holes, so that the to-be-bound files can be bound into a bound file. The simple binding jig is quite convenient to use.