The invention provides a household garbage incinerator for controlling preheating of intake air. The incinerator comprises a burning furnace body, an air blower, a temperature sensor and a control mechanism, wherein the burning furnace body comprises an upper furnace body and a lower furnace body; the upper furnace body comprises a first inner housing and a first outer housing; a first partition plate, a second partition plate,..., and the nth partition plate divide a first gap into a first preheating chamber, a second preheating chamber,..., and a (n+1)th preheating chamber from bottom to top; an air inlet communicates with the first preheating chamber, a plurality of first air nozzles are arranged at one end, far from the air inlet, of the first partition plate, a plurality of second air nozzles are arranged at one end, far from the first air nozzles, of the second partition plate,..., and a plurality of nth air nozzles are arranged at one end, far from the (n-1)th air nozzles, of the nth partition plate, and movable valves are arranged in the first air nozzle, the second air nozzle,..., and the nth air nozzle; the temperature sensor is used for detecting the air temperature in the (n+1)th preheating chamber in real time; and a control mechanism is connected to the movable valves and the temperature sensor. By the household garbage incinerator for controlling preheating of intake air provided by the invention, excellent preheating effect is achieved, and garbage combusts more fully.