NOVELTY - A multistage device for processing household organic garbage comprises an air storage tank (1), a fermenting device (2), and a multistage crushing and pulping device (3); where the fermenting device (2) comprises a fermenting pool shell (10), a circulating pump (4), a water heater (5) with expansion water tank, a stirring device (6), an electrical appliance control case (7), a sunshine heating device (8), and a vacuum pump (9); and a heat exchanger (12) is mounted on the lower part of a substrate for the fermenting pool shell (10).    USE - The multistage device is useful for processing household organic garbage (claimed).    ADVANTAGE - The multistage device can obtain a large amount of marsh gas. Moreover, it can completely process the ferment of the household organic garbage; and the discharge of the processed waste residue had no pollution to the environment.    DETAILED DESCRIPTION - A multistage device for processing household organic garbage comprises an air storage tank (1), a fermenting device (2), and a multistage crushing and pulping device (3); where the fermenting device (2) comprises a fermenting pool shell (10), a circulating pump (4), a water heater (5) with expansion water tank, a stirring device (6), an electrical appliance control case (7), a sunshine heating device (8), and a vacuum pump (9); the sunshine heating device (8) and the vacuum pump (9) are arranged on top of the fermenting pool shell (10); the electrical appliance control case (7), the circulating pump (4), the water heater (5) with expansion water tank, the stirring device (6), and pollution discharging valve (11) are arranged on a side wall of the fermenting pool shell via a mounting frame; and a heat exchanger (12) is mounted on the lower part of a substrate for the fermenting pool shell (10).    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the multistage device for processing household organic garbage.    Air storage tank (1)    Fermenting device (2)    Multistage crushing and pulping device (3)    Circulating pump (4)    Water heater (5)    Stirring device (6)    Electrical appliance control case (7)    Sunshine heating device (8)    Vacuum pump (9)    Fermenting pool shell (10)    Pollution discharging valve (11)    Heat exchanger (12)