The utility model discloses an oil and gas separator blast pipe anti -freezing device, be applied to exhaust duct on, a serial communication port, including temperature measurement device, heating device, heat preservation, fixing device, temperature measurement device sets up on the pipeline outer wall, heating device set up in exhaust duct is last, the heat preservation covers completely heatingdevice, fixing device is used for fixing the heat preservation, heating device twines on the pipeline for the electric tracing line, and temperature measurement device sets up at exhaust duct terminally, the beneficial effect of the utility model, through artificial controllable heating, let blast pipe and heating device carry out the heat transfer and solve frozen problem, use cost is low, simple structure, simple to operate, occupation space is little, can be convenient in problem, maintenance that solution under the prerequisite that does not change current oil and gas separator structureis frozen.