The utility model is an antifreezing joint of a pressure gauge, and aims to prevent the pressure gauge from freezing in the winter and facilitate the production management in the winter. The antifreezing joint comprises a joint body; a plunger is installed in a pressure transmission channel of the joint body; and antifreeze is filled at the top of the plunger so as to prevent the pressure gauge from freezing and damaging by freezing. According to the utility model, the antifreeze is filled in the pressure transmission channel of the joint body, and the plunger is used to prevent the antifreeze from contacting the liquid in the pressure transmission channel; the pressure gauge can be effectively prevented from damaging by freezing; the accuracy of recording the winter production data is obviously improved; the damage of the pressure gauge is reduced; the production cost is reduced; and the workload of the worker is reduced.