The invention discloses a high-pressure chamber temperature control method and system and is applicable to the automatic control field. According to the high-pressure chamber temperature control system, first temperature data are detected through a high-pressure chamber temperature probe; a power battery temperature probe tests second temperature data of the interior of a battery and transmits the second temperature data to a vehicle control unit; the vehicle control unit receives the first temperature data through an instrument CAN bus; and based on the first temperature data and the second temperature data, the vehicle control unit processes, analyzes and sends air conditioner operation instructions, and an air conditioner controller adjusts the temperature of a high-pressure chamber through receiving the instructions of the vehicle control unit. Air output speed is adjusted, and therefore, it can be ensured that the temperature in the high-pressure chamber is in a reasonable range.