Dry transformer temperature controller is a new generation of multi-function computer temperature controller designed for reliable operation of air-cooled dry power transformer. Three Pt100 platinum thermal resistors embedded in the three-phase winding wire package of the dry power transformer are used to detect the temperature rise of the dry power transformer wire package, and according to the temperature rise, the start and stop of the cooling fan and the overtemperature alarm until the ultra-high temperature trip are automatically controlled to ensure the safe operation of the dry power transformer. Due to the use of advanced RISC monolithic computer combined with advanced I2C storage and adjustment technology, according to JB/T7631 standard design, the thermostat has the characteristics of simple structure, reliable operation and strong anti-interference ability. At the same time, the thermostat also has a "black box" function, which can record the temperature of the three winding packages before the power failure and the working state of the machine.