The invention discloses a battery box heating system. In the temperature control system, when a battery box needs to be heated, by controlling opening and closing of all electric stop valves, heat ina driving motor is guided into the battery box, the situation that a PTC is arranged on a battery box pipeline for independent heating is avoided, thus the electricity consumption in PTC heating is reduced, and the endurance of the battery box is increased accordingly. A water-water heat exchanger is arranged at an inlet of the battery box, and thus slow heating of the battery box can be ensured.