To provide a device for utilizing waste heat of a hot air valve capable of effectively utilizing waste heat of the hot air valve.

The hot air valve 1 comprises a refrigerant circuit 4 for circulating a refrigerant to a valve element 2 and a valve box 3, while a high temperature fluid is employed as a fluid to be controlled. An absorption water cooler/ heater 5 comprising an evaporator 6, an absorber 7, a regenerator 8 and a condenser 9 is provided. The refrigerant circuit 4 is connected to a heat exchanger 8a functioning as a heating means for the regenerator 8. Waste heat of the hot air valve 1 collected by a cooling medium is used as a driving heat source of the absorption water heater 5.