The invention belongs to the field of biomass energy, and discloses a continuous biomass pyrolysis gasification device and method. The device comprises a feeding unit, a pyrolysis unit, a gasificationunit, a heat exchange unit and a combustion unit which are arranged in sequence; the feeding unit sends biomass into the pyrolysis unit for pyrolysis to produce coke and volatile matter, the coke andthe volatile matter are subjected to a gasification reaction in the gasification unit to produce combustible gas and gasification residues, the combustible gas and the gasification residues exchangeheat with air in the heat exchange unit, hot air is partially sent into the gasification unit, the other part of hot air is sent into the combustion unit, the combustible gas after heat exchange is sent out from the heat exchange unit, the gasification residues after heat exchange are conveyed into the combustion unit for combustion, high-temperature flue gas generated by the combustion is conveyed to the pyrolysis unit and exchanges heat with the biomass to become low-temperature flue gas, and the low-temperature flue gas and ash generated by the combustion are utilized for heating air to make the heated air serve as secondary air of the combustion unit. By means of the continuous biomass pyrolysis gasification device and method, the gradient utilization of physical heat can be achieved,the waste heat of the flue gas and the ash is fully recycled and utilized, the biomass is completely utilized, the energy consumption for gasification is low, and the gasification efficiency is high.