The utility model discloses a flue gas waste heat recovery device based on utility boiler hydrophily GGH (gas-gas heater) flue gas temperature control. A conventional utility boiler hydrophily GGH is poor in working stability and cannot effectively utilize flue gas waste heat. The flue gas waste heat recovery device provided by the utility model comprises a boiler air pre-heater and an outlet flue duct thereof, a flue temperature control and waste heat recovery device, a hydrophily GGH, inlet and outlet water feeding channels of the flue temperature control and waste heat recovery device, and a turbine low-pressure heater and a steam extracting pipeline thereof, wherein the flue gas side front end of the flue temperature control and waste heat recovery device is communicated with the air pre-heater flue channel; the flue gas side rear end of the flue temperature control and waste heat recovery device is communicated with the hydrophily GGH flue duct; the water side of the flue temperature control and waste heat recovery device is communicated with turbine low-pressure heater inlet and outlet water feeding pipeline. The water feeding amount of the flue temperature control and waste heat recovery device is controlled to adjust the inlet flue temperature of the hydrophily GGH and to perform waste heat recovery on the water absorbed flue gas heat, so that the boiler hydrophily GGH is guaranteed to work stably, and the purpose of efficiently utilizing flue gas waste heat recovery energy is achieved.