The utility model discloses a biomass gasification coupling coal fired power generation gasification gas utilizes system, take out water heat exchanger, give water heat exchanger, gas gas heater including gasification gas heat exchanger, circulating water pump, high pressure heater, circulating water pump is connected to the gasification gas heat exchanger, circulating water pump connects two thetunnel, connects high pressure heater all the way and takes out water heat exchanger, and another way is connected for water heat exchanger, high pressure heater takes out water heat exchanger, all connects gas gas heater for water heat exchanger's the other end, and the gasification gas heat exchanger is connected to gas gas heater's the other end. The beneficial effect of the utility model, realize the degree of depth cascade utilization of gasification gas sensible heat, increased steam turbine acting volume during the high load capacity, guaranteed denitration efficiency during the low -load, and the hot media water of gasification gas heating heating boiler after the high pressure heater that flows through takes out water heater or gives water heater discharges fume, promotes exhaustgas temperature, has reduced " gypsum rain " phenomenon, prevents that the chimney from corroding.