NOVELTY - Water cooling biomass gasifying furnace with double fluidized beds comprises gasifying furnace body (1), feeding mechanism (2), air intake device (3), igniting device, slag-off device (5), fuel gas dust removal mechanism (6) and fuel gas outlet (7), where the feeding mechanism (2) is above the igniting device, the air intake device (3) and the slag-off device (5) are located under the igniting device, where the gasifying furnace body (1) adopts double-fluidized bed structure which is composed of main fluidized bed (11) and secondary fluidized bed (12) arranged side by side.    USE - The device is useful for cooling biomass (claimed).    ADVANTAGE - The invention improves the cleanness of the mixed gas entering into the condensing tower.    DETAILED DESCRIPTION - Water cooling biomass gasifying furnace with double fluidized beds comprises gasifying furnace body (1), feeding mechanism (2), air intake device (3), igniting device, slag-off device (5), fuel gas dust removal mechanism (6) and fuel gas outlet (7), where the feeding mechanism (2) is above the igniting device, the air intake device (3) and the slag-off device (5) are located under the igniting device, where the gasifying furnace body (1) adopts double-fluidized bed structure which is composed of main fluidized bed (11) and secondary fluidized bed (12) arranged side by side; the upper parts of the main and secondary fluidized beds (11, 12) are connected with each other; the main fluidized bed (11) is the gasifying furnace body; the feeding mechanism (2) and igniting device are both located on the main fluidized bed (11); the feeding mechanism (2) is located on the outer wall of the main fluidized bed (11), the igniting device is located under the feeding opening of the main fluidized bed (11), and the fuel gas dust removal mechanism (6) is mounted in the fuel gas outlet (7) of the secondary fluidized bed (12).    DESCRIPTION OF DRAWING(S) - The drawing shows the front view of the Water cooling biomass gasifying furnace.    Gasifying furnace body; (1)    Feeding mechanism; (2)    Air intake device; (3)    Slag-off device; and (5)    Fuel gas dust removal mechanism (6)