The invention relates to a biomass direct combustion gasification reverse combustion furnace capable of saving energy and reducing emission, comprising a biomass direct combustion gasification chamber, a gasification reverse combustion device, a tail gas combustion device and a water tank. In order to improve heat energy efficiency, the biomass direct combustion gasification reverse combustion furnace is characterized by being internally provided with a hot water circulation pipe and a hot water circulation container, an exhaust pipe used for discharging high-temperature gas penetrates through the working water tank, and a strategy of multi-stage heat energy utilization is realized. Biomass direct combustion is a simple gasification mode, the gasification reverse combustion device and the tail gas combustion device are burned to faint red by firework and hot air current generated during the biomass direct combustion like welding blowing, and oil tarings generated during strong direct combustion of biomass are cracked for spontaneous combustion. A gasification device is not particularly provided in the invention, but the structures of the gasification reverse combustion device and the tail gas combustion devise are designed with supernatural workmanship and better than a gas furnace, thereby the problem of easily generating tar compounds during biomass gasification and combustion is overcome, and a simple and practical method is provided for biomass gasification utilization. The furnace has the advantages of good performance and multi purposes and can be used for substituting an electric cooker and a water heater and delivering steam to another storage container for operation, wherein generalized functions can be fulfilled during use. The fuel used in the furnace is inexhaustible, and moreover, the furnace has remarkable energy-saving and environment-protection effects.