The utility model relates to a cap-type anti-imitation device used in an easy-to-open ring on a plastic bottle on a wing ring. The utility model is structurally characterized in that a bottleneck part is provided with the wing ring made into integration with a bottle body; an anti-imitation cap is additionally arranged behind a bottle closing cap. When assembled, the flange of the cap body is welded or glued on the wing ring once; the wing ring is provided with the easy-to-open ring. The plastic bottle using the device can be opened to drink as long as opening the easy-to-open ring. The bottle is disposable because once the easy-to-open ring is opened, the wing ring is broken, and as a result, the utility model solves the problem of imitation by making use of the original bottles of the beverage, such as the mineral water, the coke, etc. by the lawbreakers. The utility model has the advantage of novel structure and provides high safety for the wide customers; the utility model is favorable to enhance the reputation of the beverage manufacturer and expand the market outlet.