Flexible functional filler, modular constructed wetland and method for purifying typical rural domestic sewage

The invention discloses a flexible functional filler, a modular constructed wetland and a method for purifying typical rural domestic sewage, and belongs to the technical field of rural domestic sewage treatment. The flexible functional filler is obtained by wrapping the functional filler with a metal woven flexible fiber wrapping material; the functional filler comprises a solid filler and embedded microorganisms; the solid filler (pelelith with the porosity of 40-50%) is used for embedding microorganisms on a spatial porous structure of the solid filler (pelelith with the porosity of 40-50%). The flexible functional filler is placed on the rigid supporting structure to form an integral flexible functional filler module. The flexible functional filler module comprises an aerobic breathing type enhanced ammonia nitrogen oxidation wetland module with three functions, a facultative denitrification wetland module and an enhanced phosphorus removal wetland module; the module is composed of three parts: an interna