The invention discloses temperature measuring equipment used for a double layer liquid metallic sodium pipeline, and an installing method thereof. The equipment consists of a pipeline, a sleeve chuckand a temperature thermocouple, wherein, the temperature thermocouple extends into the pipeline and is fixed in the pipeline in a sealing way by the sleeve chuck; the head of the pipeline is pressed onthe inner layer pipeline of the double layer pipeline. The installing method of the equipment comprises the following steps: the outer layer pipeline of the double layer pipeline is cut into an ellip tic outer layer pipeline which is provided with holes and then sheathed on the pipeline; the method is characterized in that (1) the head of the pipeline sheathed with the elliptic outer layer pipeline is pressed on the outer wall of the inner layer pipeline; (2) the pipeline and the elliptic outer layer pipeline, as well as the elliptic outer layer pipeline and the pipeline are respectively welded; (3) the temperature thermocouple is inserted into the head of the pipeline along the pipeline and fixed on the pipeline by the sleeve chuck. The equipment and the installing method of the inventionare safe and reliable, have simple structure, simple and easy processing and installing steps, and can replace the temperature thermocouple momentarily.