The invention discloses a power distribution cabinet and a temperature adjustment method thereof. The power distribution cabinet comprises a cabinet body, a temperature adjustment module, a temperature sensor, a micro-control unit, a display module, a communication module and a storage device, wherein the temperature sensor, the micro-control unit, the display module, the communication module and the storage device are arranged in the cabinet body; the temperature sensor, the display module, the temperature adjustment module, the communication module and the storage module are electrically connected with the micro-control unit separately; the temperature sensor comprises a first temperature sensor group, a second temperature sensor group and a third temperature sensor group; the first temperature sensor group is arranged at the position, close to the bottom surface, of the cabinet body; the third temperature sensor group is arranged at the position, close to the top surface, of the cabinet body; the second temperature sensor group is arranged between the first sensor group and the second sensor group; and the display module comprises normal, warming and alarming three-color background lights. According to the power distribution cabinet, the internal temperature can be accurately displayed and measured, the temperature is intelligently adjusted, and the work stability and reliability of the power distribution cabinet are improved.