The invention discloses a self-heating continuous carbonization and activation processing method for biomass. The method comprises steps of: feeding biomass materials into a drying/carbonization integrated furnace, feeding hot wind, drying and carbonizing the initial biomass materials, and stopping the hot wind; feeding a fixed quantity of air into the drying/carbonization integrated furnace, combusting combustible volatile compounds formed in the carbonization process of the initial biomass materials, and adopting the generated heat to dry, heat and carbonize subsequent biomass materials, thus forming a carbonized material and a mixed gas; feeding the carbonized material to an external-heated type activation furnace to perform activation, thus forming an activated material and an activated gas; feeding the activated gas and the mixed gas to a combustion chamber of the external-heated type activation furnace to be combusted so as to maintain the temperature of the external-heated type activation furnace and feeding the waste heat to a waste heat boiler to prepare water vapor; and feeding a portion of the water vapor to the external-heated type activation furnace, and feeding the rest of the water vapor into steam power generating units to generate power. The processing method is maintained by the heat generated in the whole processing process, thus achieving effects of energy conservation, emission reduction and efficient energy utilization.