The utility model provides a case temperature automatic control circuit which comprises a temperature sensor, a fan, a field-programmable gate array (PFGA), a core processor, a liquid crystal display (LCD) and a buzzer. The LCD is embedded in a case shell, and the FPGA is connected with the fan, the LCD, the buzzer, the core processor and the temperature sensor through a fan rotation speed control circuit and a fan rotation speed collecting circuit, a TTL level shifter, a real-time clock, an SPI interface and a temperature reading interface respectively. By means of the technical scheme, work noise of a case is lowered, automatic control of case temperature and visualization of case temperature and fan rotation speed are achieved, and operation reliability of the case is improved.