NOVELTY - Comprehensive treatment of municipal domestic garbage comprises separating out large combustible materials, treating remaining garbage in water separation device to separate out bricks, tiles and organic matter, air-separating organic matter to separate out plastics, adding organic matter obtained in air separation and sludge obtained in water separation in degradative reduction equipment, adding catalyst, introducing hydrogen gas, reacting for 1-3 hours, discharging excess liquid and performing multiple-effect evaporation, and blast-discharging obtained solid material.    USE - Method for comprehensive treatment of municipal domestic garbage to produce RDF, construction materials, commodity plastics and organic fertilizer (claimed).    ADVANTAGE - The treatment method conforms to the principle of pollution-free disposal, reduction and recycling of garbage.    DETAILED DESCRIPTION - Comprehensive treatment of municipal domestic garbage comprises:    (A) separating out large combustible materials and forming into refuse-derived fuel (RDF);    (B) treating remaining garbage in water separation device to obtain sludge and separate out bricks, tiles and organic matter;    (C) crushing bricks, tiles and stone to manufacture construction materials;    (D) air-separating organic matter to separate out plastics and granulating into commodity plastics;    (E) adding organic matter obtained in air separation and sludge obtained in water separation in degradative reduction equipment, adding catalyst comprising sulfuric acid, hydrochloric acid, nitric acid and/or phosphoric acid, introducing hydrogen gas to adjust pressure to 0.6-1.5 MPa and temperature to 160-200 degrees C, and reacting for 1-3 hours;    (F) discharging excess liquid and performing multiple-effect evaporation; and    (G) blast-discharging obtained solid material having water content of 40%, extruding to reduce water content to less than or equal to 30% and manufacturing into organic fertilizer or RDF.