The utility model relates to a pulverized coal gasification reaction device of a gas-solid fluidized bed. The utility model belongs to the technical field of coal chemical industry, specifically, an ash discharge pipe is arranged at the bottom of the gasification furnace; a gas distribution cavity is further formed in the bottom of the gasification furnace; the gas distribution cavity is connectedwith a combustion-supporting air pipe; an ash spiral conveying pipe is mounted at the bottom of the ash discharging pipe; a water-cooling sleeve sleeves the outer part of the ash spiral conveying pipe; an air pipe is also sleeved outside the water-cooling sleeve; an air outlet of the air pipe is connected with the buffer air tank; the buffer gas tank is connected with the combustion-supporting air pipe; the top of the gasification furnace is connected with a cyclone dust collector; the top of the cyclone dust collector is connected with the air preheater; an air outlet of the air preheater isconnected with the buffer air tank, the bottom of the cyclone dust collector is connected with a dust funnel, the dust funnel is connected with the gasification furnace, an air jet pipe is arranged in the material return pipe, the air jet pipe is connected with the buffer air tank, the structural design is reasonable, ash heat can be effectively utilized, and combustion air pressure is more stable.