Temperature measuring device

A temperature measuring device comprises a rack, a drive unit, a return-to-zero sensor, a position detection unit, a current detector and a programmable control unit. The programmable control unit controls the drive unit and drives a linked piece and a tempilstick to move. When the tempilstick touches a solid body, and a current value of a motor is larger than a preset critical current value of a solid-liquid interface after comparison by the programmable control unit, the programmable control unit controls the motor to operate in a reverse direction. At the same time, the programmable control unit carries out calculation based on a detection signal of the position detection unit, a return-to-zero signal of the return-to-zero sensor and a detection signal of the current detector, cooperates with the tempilstick to measure temperature, and can accurately measure the temperature changes of different positions.