The utility model discloses an antifreezing joint for a pressure gauge. The antifreezing joint is used for the antifreezing of the pressure gauze of an oilfield oil pipeline. A pressure-transmitting piston is arranged in a direct-through end of a triple-valve body; an annular plug is fixed at the direct-through end of the triple-valve body; an internal thread is arranged at the other direct-through end of the triple-valve body; an adjustable plug is fixed in the other direct-through end of the triple-valve body and is internally connected with a regulating valve rod; a hand wheel is arranged at the outer end of the regulating valve rod; an internal thread is arranged at the vertical end of the triple-valve body; a switch screwed plug is fixed in the vertical end of the triple-valve body; the switch screwed plug is connected with a switch valve rod by the internal thread; the inner end part of the switch valve rod is connected with a switch piston; a fixed screw hole of the pressure gauge is arranged on the wall of the vertical end of the triple-valve body; and a closed cavity formed by the triple-valve body is internally filled with antifreezing liquid. The antifreezing joint has the effects that the antifreezing joint is arranged on an oilfield gathering pipeline, the pressure of the pipeline is conducted to a measuring instrument by the antifreezing liquid, and the antifreezing joint ensures the normal recording of the pressure data in the pipeline in winter, so that the oilfield production is safe and reliable.