Oil well casing gas recycling device

The utility model relates to an oil well casing gas recycling device. Wellhead recycle casing gas installed on oil well can prevent an output liquid of the oil well from pouring into the oil well casing. The device comprises a casing connecting line pipe which is provided with a separator inlet valve, a uniflow valve and a casing gas pressure gauge. A separator is connected with the casing connecting line pipe. The separator is provided with a separator outlet valve, a pressure gauge and a release valve. Rise of the return pressure of the oil well can be effectively prevented or the output liquid of the oil well is prevented from pouring into the oil well casing effectively. According to the oil well casing gas recycling device provided by the utility model, the separator is provided with the pressure gauge, and the casing connecting line pipe is provided with the casing gas pressure gauge so that pressure change in the production process of the oil well can be observed at any time so as to take measures immediately to realize continuous directional emission at constant pressure of the casing gas. The device is convenient to connect and can be installed for use and disassembled for future use at any time according to the demand of well condition. The device can be installed or disassembled by one person and is simple to operate, and normal production of the oil well can be ensured.