The invention discloses a slipping-preventing zipper head, which comprises a sliding block body and a cap, wherein the sliding block body comprises an upper wing plate, a guide post, a lower wing plate, and a locking mechanism, wherein the upper wing plate is provided with a connecting part; the cap comprises a hinged part arranged on the front end and a fastening part arranged on the rear end; the hinged part of the cap is hinged with the connecting part; the locking mechanism comprises a locking blocks which can be arranged on the upper wing plate movably; a gap is formed between the front end wall of the cap and the upper wing plate; the locking mechanism is arranged in a way of corresponding to the cap; and when the zipper head works, the locking block of the locking mechanism can be moved to the gap to press against the front end wall of the cap. The slipping-preventing zipper head has the advantages of simple structure, self-locking and stability.