High-temperature high-precision and ultrahigh pressure tungsten-rhenium thermocouple

The utility model relates to a high-temperature high-precision and ultrahigh pressure tungsten-rhenium thermocouple, and belongs to the technical field of tungsten-rhenium thermocouples. The high-temperature high-precision and ultrahigh pressure tungsten-rhenium thermocouple is characterized in that a refractory metal protection tube and a fixing device are fixedly connected through brazing. Compared with a traditional fixed connection mode of argon-arc welding, a brazing seam is high in strength and not easy to break. In addition, the refractory metal protection tube is further provided with an opening, thereby realizing a purpose that pressure difference does not exist in the refractory metal protection tube, avoiding conditions of bending, breakage and the like of the refractory metal protection tube, and preventing the tungsten-rhenium thermocouple from losing efficacy.