The invention relates to a downer-fixed bed pyrolysis-gasification integrated method and device, and the problems that in the prior art, the tar yield is low, the heat transfer efficiency is low, andlow-rank coal is difficult to utilize are mainly solved. A downer pyrolysis furnace and a fixed bed gasification furnace are combined, and the method comprises: raw materials are added from the upperpart of a downer pyrolysis furnace and heated by a gasified product gas from the fixed bed gasification furnace, a pyrolysis reaction is performed, and a pyrolysis gas, tar and coal coke are generated; by separation, a mixed gas of the gasified product gas and the pyrolysis gas is sent to a condensing device for rapid cooling, wherein a condensable gas is cooled to form the tar, and a non-condensable gas is further purified and treated; the coal coke is sent into the fixed bed gasification furnace for gasification reaction to generate a gasified product gas, the high-temperature gasified product gas is sent into a downer pyrolysis furnace to be used as a heat source and a pyrolysis medium required by pyrolysis to carry out pyrolysis reaction, the energy consumption of the whole circulatingsystem is reduced, and the method can be applied to the technical field of coal chemical industry.