The invention provides a clean efficient biomass multifunctional integrated furnace which comprises a housing and a biomass gasification device, a biomass gas burner and a fan which are arranged in the housing. The biomass gasification device comprises a gasification device housing; a charging barrel is arranged in the gasification device housing; a furnace chamber is arranged below the charging barrel; the furnace chamber is connected with the fan through a gasification agent spray nozzle and a pipeline; an upper drawing tooth is fixed on the inner wall of the gasification device housing; the upper drawing tooth comprises a horizontal section and a vertical section; the horizontal section is positioned below the charging barrel and fixed on the gasification device housing; the vertical section is close to the inner wall of the charging barrel; a lower drawing tooth is fixed at the bottom of the charging barrel. The biomass multifunctional integrated furnace provided by the invention achieves double cracking of tar in the biomass integrated furnace, enables the tar to be finally and completely gasified and burnt, not only increases the heat value of gas and improves energy efficiency, but also does not discharge the tar, wastewater and waste gas so as to achieve the clean and efficient effects.