The invention provides an integrated gasification cycle combined electricity generating device for cleaning domestic garbage. A deferrization crusher and a lifting pipe are sequentially arranged at the front end of a carrying cycle bed, a gas distributor and an ash discharge pipe are arranged at the bottom of the carrying cycle bed, a gas current bed is arranged in a position 1000-2000mm away from the bottom of the carrying cycle bed, a solid feed opening is formed in a position 500-3000mm away from the gas current bed, and a second-stage gas-solid separator is arranged at the top of the carrying cycle bed; first-stage separation course particle ash is guided into the bottom of the carrying cycle bed, second-stage separation fine particle ash is connected to the gas current bed through a material returning device, and a gas outlet is connected with an inlet of a purifying reactor through an air heat exchanger and a fuel gas outlet; an outlet of the purifying reactor is connected to a gas electricity generator, and an outlet of the gas electricity generator is connected with a steamer electricity generator through a vapor generator; the gas electricity generator and the steamer electricity generator are connected to an electric power pressure regulating output device; a leachate spraying opening is formed in the side surface of the middle part of the ash discharge pipe, an air guiding pipe is arranged at the lower part of the ash discharge pipe, and a heat exchange bin is directly connected to the bottom of the ash discharge pipe; and an upper water outlet and a lower water outlet are formed in the side surface of the heat exchange bin, and a rotary discharge valve is arranged at the bottom of the heat exchange bin for timing discharge.