The utility model provides a multifunctional biomass gasification furnace. The gasification furnace comprises a furnace body and a charging hopper arranged on one side of the furnace body, wherein a gasification chamber is formed at the middle part of the furnace body; a grate and a rocking handle connected therewith are arranged at the bottom of the gasification chamber; an ignition mouth is formed above the grate; an ash removal chamber is formed below the grate; a helical air distribution plate is arranged on the grate; a combustion chamber is formed above the gasification chamber and communicated with a smoke removal channel; a cooking stove is positioned at the bottom of the combustion chamber and directly communicated with the gasification chamber through an air outlet pipe; a water jacket and an air distribution chamber are arranged on the periphery of the combustion chamber and are independent with each other; an water outlet is formed at the upper part of the water jacket, and a water inlet is formed at the lower part thereof; an air inlet communicated with a blower is formed at the lower part of the furnace body; the air distribution chamber and the air inlet are both connected with an air distribution pipe; and the air distribution pipe provides air for the gasification chamber through the helical air distribution plate connected with the air distribution pipe. The gasification furnace has the advantages of simple structure, convenient use, complete and uniform combustion of fuel, high gasification efficiency, less generation of tar and steam, resource conservation and environmental protection, and can achieve three functions of heating, bathing and cooking.