The utility model discloses a water circle device, wherein, including steam pocket water -feeding pump, steam pocket, forced circulation pump and at least one evaporator assembly, every evaporator assembly includes at least one evaporimeter, the forced circulation pump with the admission port optionally intercommunication of evaporimeter, the admission port of steam pocket with steam pocket water -feeding pump optionally intercommunication, the downtake interface of steam pocket with forced circulation pump optionally intercommunication, the return water mouth of steam pocket and each among the evaporator assembly each the return water mouth optionally intercommunication of evaporimeter, the steam pocket can be received the steam -water mixture that the evaporator assembly heat exchange obtained, be provided with the steam delivery outlet on the steam pocket. The utility model also discloses a waste heat recovery utilizes the system. The utility model discloses a vapour water circle device can realize thermal make full use of.