The invention discloses a hot-melt yarn fixation method for PET tatting textiles. According to the hot-melt yarn fixation method, a warp yarn or a weft yarn is produced from a second PET tow doped with a second PET filament with a relatively low melting point, a spun PET tatting textile is heated to a certain temperature (high than the melting point of the second PET filament and lower than the melting point of a first PET filament) in the processing process, the second PET filament with relatively low melting point is melted, the first PET filament with relatively high melting point is not melted, the melted second PET filament uniformly infiltrates into the PET tatting textile or uniformly covers on the surface of the PET tatting textile, the joint between the warp yarn and the weft yarnare adhered together, and cooling is carried out, so as to finish the yarn fixation of the PET tatting textile. Compared with the prior art, the method is relatively environment-friendly, the thickness and weight of the textile are not increased, and the whole textile contains one PET material, so that the recycling and the regeneration design are easily realized.