Permanent gas dew point adjusting device applied to laboratory

The utility model discloses a permanent gas dew point adjusting device applied to a laboratory. The permanent gas dew point adjusting device applied to the laboratory is characterized by comprising a gas storage tank and a main pipeline which is connected with the gas storage tank, wherein the main pipeline is divided into two pipelines; a first pipeline is connected with a gas mixing pipe through a second gas flow adjusting valve; a second pipeline is connected with the gas mixing pipe through a humidifier and a one-way valve; the gas incoming from the two pipelines is fully mixed in the gas mixing pipe; the permanent gas dew point adjusting device applied to the laboratory also comprises a finished product gas tank which is connected with the gas mixing pipe; the finished product gas tank is directly connected to a using unit through the pipelines. The permanent gas dew point adjusting device applied to the laboratory is capable of fully automatically adjusting and controlling a ratio of wet gas to dry gas (the raw material gas) so as to obtain the gas with required dew point; moreover, the permanent gas dew point adjusting device applied to the laboratory is simple to manufacture, easy to operate and relatively wide in range of application.