Humidity adjusting device

The utility model belongs to the technical field of gas humidity adjustment. The invention particularly relates to a humidity adjusting device. The system comprises a PLC controller, a humidity adjusting chamber, a switch valve, a gas flow adjusting valve and a humidity sensor. A hollow annular water transmission film is arranged in the humidity adjusting chamber; the humidity adjusting chamber isconnected with a first air inlet pipeline, a first air outlet pipeline, a second air inlet pipeline and a second air outlet pipeline; gas with different humidities is respectively introduced into theinner surface and the outer surface of the hollow annular water transmission membrane; the switch valves are arranged on the first air outlet pipeline and the second air outlet pipeline; wherein thegas flow regulating valve is arranged on the first gas inlet pipeline and the second gas inlet pipeline, the humidity sensor is arranged at a connecting port of the humidity regulating chamber and thepipelines, and the switch v