The invention provides a temperature sensor. The temperature sensor comprises a first flexible substrate, wherein the first flexible substrate is a strong thermally conductive substrate with bending or stretching characteristics; a temperature-sensitive material nanowire disposed on the first flexible substrate for temperature sensing; and electrodes arranged at the two ends of the temperature-sensitive material nanowire in a contact way. Therefore, the temperature sensor provided by the invention facilitates convenient, real-time, fast, and continuous accurate temperature measurement.