Impurity removing and humidifying device for separation and reinjection of oilfield associated gas

The utility model relates to an impurity-removing and humidifying device for separation and reinjection of oilfield associated gas. The impurity-removing and humidifying device comprises a humidifying tank, an inlet pipeline of the humidifying tank is connected with an associated gas source, a blow-off pipeline is arranged at the bottom end of the humidifying tank, and the humidifying tank is connected with an outlet pipeline and a humidifying pipeline; the inlet pipeline is connected with an inlet humidity automatic detection device; the outlet pipeline is provided with an outlet humidity automatic detection device and a membrane separation device; the system further comprises a bypass pipeline, the inlet end of the bypass pipeline is connected with a connecting pipeline between the inlet humidity automatic detection device and the humidifying tank, and the outlet end of the bypass pipeline is connected with a connecting pipeline between the outlet humidity automatic detection device and the membrane separat