Construction method of sealed joint of composite geomembrane face dam

The invention discloses a construction method of a sealed joint of a composite geomembrane face dam. A new structure is provided with regard to a design of burying a geomembrane, which is several meters long, in an existing sealed joint of a geomembrane face dam in a folding manner to increase a seepage path. By means of such a structure, the length of the geomembrane buried in the folding manner can be greatly shortened, and a ''stainless steel folding fan type V-shaped corrugated water stop'' on a surface layer is used as the water stop of the sealed joint. Such a structure is also universal to all sealed joints such as toe slab joints with equal-altitude or different-altitude supports on two sides, peripheral joints, dam top sealed joints and the like; the stainless steel folding fan type V-shaped corrugated water stop is formed by pressing a stainless steel material that is less than 1mm thick into V-shaped corrugations that are only about 20mm high, and has great flexibility, under which a mixed elastic