NOVELTY - Domestic sewage treatment method of constructed wetlands comprises digging one cell body (12) on earth, filling with sand clay (4), and planting plants (5). Underneath of side cell body of inlet port (1) is set with inlet retaining valve (1A), and from which sewage (1a) enters cell body and infiltrates toward upside to make descending axis of plants, sand clay, and sewage to be formed to be sand spit ecosystem with biomembrane, through which sewage is purified. Crust (3) formed by biomembrane is automatically irrigated, softened, and gravitated by using L-shaped pipe (2).    USE - Method is for domestic sewage treatment of constructed wetlands.    ADVANTAGE - The method solves the problem of blockage of biomembrane of constructed wetlands and being short life expectancy. In order to prevent producing strong methane to bring explosion in sand spit ecosystem with biomembrane, silo and removable cover are set, and people can enter to test, and ensure safe running.    DETAILED DESCRIPTION - Domestic sewage treatment method of constructed wetlands involves digging one cell body (12) on earth, in which is filled with sand clay (4) and plants (5) are planted. Underneath of side cell body of inlet port (1) is set with inlet retaining valve (1A), and from which sewage (1a) enters cell body and infiltrates toward upside to make descending axis of plants, sand clay, and sewage to be formed to be sand spit ecosystem with biomembrane, through which sewage is purified. Crust (3) formed by biomembrane is automatically irrigated, softened, and gravitated by using L-shaped pipe (2). Inlet retaining valve is cooperated with overflowing function of L-shaped pipe to make inlet retaining valve adjust for the port and closing of inflow automatically. Vertical sullage pipe (9) and its inner sullage retaining valve (10) are set for gravitated drift along dregs (9.2) of purified sewage and softened crust, utilizing drought head produced in sullage pipe by machine or manpower to suck out drift along dregs to surface of sand spit. An INDEPENDENT CLAIM is included for a sewage treatment system of domestic sewage treatment method of constructed wetlands.    DESCRIPTION OF DRAWING(S) - The drawing is a sectional view of a sewage treatment system of domestic sewage treatment method of constructed wetlands.    Inlet port (1)    Inlet retaining valve (1A)    Sewage (1a)    L-shaped pipe (2)    Crust (3)    Sand clay (4)    Plants (5)    Vertical sullage pipe (9)    Dregs (9.2)    Inner sullage retaining valve (10)    Cell body (12)