The invention discloses a biomass combustion technology which comprises the following steps: a, smashing biomass fuel into powder; b, pneumatically sending the powdery biomass fuel into a boiler furnace, and quickly combusting the powdery biomass fuel at 750-950 DEG C under pressure; c, after combustion, leading fixed carbon and ash into a heat exchange zone of a boiler, and lowering the temperature to below 600 DEG C; and d, leading the fixed carbon and ash out of the boiler through induced air for dust removal and recovery. According to the biomass combustion technology provided by the invention, the powdery biomass fuel is sent into the boiler furnace to be subjected to suspension combustion, and the fuel is combusted at 750-950 DEG C, so that the volatilization of moisture in the fuel is facilitated and the fuel is combusted quickly; and the fixed carbon and ash are led into the rear heat exchange zone of the boiler, where the temperature is below 600 DEG C, so that the generation of sodium dioxide, potassium dioxide, magnesium dioxide and the like of the ash is prevented, and meanwhile the phenomenon of coking is greatly reduced.