Temperature control system of refrigerator

The invention provides a temperature control system of a refrigerator, a temperature sensor is arranged in the refrigerator, the temperature sensor is electrically connected with a main control board, and the main control board is electrically connected with a compressor, so that temperature fluctuation is reduced by controlling the action of the compressor. When the refrigerator is powered on for the first time, the compressor works at the temperature control high frequency, the temperature can reach the temperature setting upper limit quickly, then the compressor operates at the temperature control low frequency and enters the small-amplitude adjusting mode, and according to the conditions such as the storage amount and size of the refrigerator and the outside air temperature, the working frequency of the compressor needed by the refrigerator is changed; according to the device, the working efficiency of the compressor is determined in a start-stop mode, so that temperature fluctuation is reduced, and the f