Waterproof zipper and preparation method thereof

The invention provides a preparation method of a waterproof zipper. The preparation method comprises the steps of supplying materials, setting dimensions, patching, punching and forming an upper stoppart. The invention also provides the waterproof zipper, wherein the waterproof zipper comprises two zipper belts with zipper teeth; notches are formed in the upper surfaces of the corresponding zipper teeth; each of the two zipper belts has a zipper tooth part and an upper stop tooth-less area; a patch is attached to one side of the upper stop tooth-less area; the upper stop part is formed on theupper stop tooth-less area in an injection molding mode; the upper stop part has a sheet-shaped part and a main body part; the sheet-shaped part is formed on the other side of the patch; the main body part is provided with an accommodating part and a channel part; and two insertion leg parts are formed on the two sides of the channel part, and each of the two insertion legs is provided with an extension part filled into t