The invention discloses a method for measuring the temperature of the glass steel pipe of a composite hollow insulator, comprising the following steps of: S1, applying different currents to conductivetubes, determining the heating power of the corresponding conductive tubes, and measuring a temperature difference between the corresponding glass steel pipes and a protective shed; S2, according tothe heating power of the plurality of conductive tubes and the values of the temperature differences between the corresponding glass steel pipe and the protective shed, determining a functional relation between the heating power and the value of the temperature differences; and S3, calculating the current heating power of the conductive tubes based on the current operating currents in the conductive tubes, and determining the actual values of the temperature differences between the glass steel pipes and the protective shed in accordance with the functional relation in step S2, measuring the actual temperature of the surface of the sheath shed, and calculating the actual temperature of the glass steel pipe in combination with the actual value of the temperature difference. The method for measuring the temperature of the glass steel pipe of a composite hollow insulator can measure the temperature of the internal glass steel pipe of the insulator onsite, and is easy to operate and low incost.