Fully automatic hot melt zig zag cutting machine is used for cutting a gapped zipper with the heat of cutters, especially for zig zag cutting of zippers with tapes made of chemical fiber fabric, such as nylon, metal and plastic zippers, with or without sliders. It is mainly used for cutting zippers with tapes made of chemical fiber fabric. It's applicable to zig zag cutting for nylon, metal and plastic zippers with or without sliders in a variety of specifications.