Gasifying agent switching device of household garbage pyrolysis gasification furnace

The utility model discloses a gasifying agent switching device of a household garbage pyrolysis gasification furnace. The gasifying agent switching device comprises a Venturi jet device, a water vapor pipe, a flue gas pipe, a gasifying agent supply pipe, a high-pressure air supply pipe and a three-way pipe, a high-pressure inlet of the Venturi jet device is communicated with a high-pressure air supply pipe; a low-pressure inlet of the Venturi jet device is communicated with a steam pipe through a steam control valve, and the other end of the steam pipe is connected with an exhaust port for household garbage drying pretreatment; an outlet of the venturi ejector is communicated with a first connecting port of a three-way pipe, a second connecting port of the three-way pipe is connected with a smoke pipe through a smoke control valve, and the other end of the smoke pipe is connected with a smoke discharging port of the household garbage pyrolysis gasification furnace; and a third connecting port of the three-way