A cooling and heat radiating box of a charger used in a high-speed train, the cooling and heat radiating box comprising a first air passage chamber and an inner chamber surrounding the first air passage chamber; a first end of the first air passage chamber is connected to an air inlet, a second end of the first air passage chamber communicates to a first blower chamber, and a first blower is disposed inside the first blower chamber; the first blower chamber is provided with an air outlet; and the air inlet, the first air passage chamber, the first blower chamber and the air outlet sequentially form a first ventilating path for realizing air flow in the first air passage chamber; the inner chamber comprises element regions and a cavity region, and heating elements are disposed in the element regions, wherein each of two sides of the first air passage chamber is provided with one of the element regions respectively; the cavity region comprises the element regions, the cavity region surrounds the whole first air passage chamber; a second blower is disposed in the inner chamber and is used for enabling air in the inner chamber to flow to form a second ventilating path; a first heat radiating fin is disposed between each of the element regions and the first air passage chamber, and the first heat radiating fin is exposed in the first air passage chamber; a second heat radiating fin is disposed between the cavity region and the first air passage chamber, and the second heat radiating fin is exposed in the first air passage chamber; the second heat radiating fin is provided both at an upper side and a lower side of the first air passage chamber; both the first heat radiating fin and the second heat radiating fin are provided on opposite sides of the first passage chamber; a first temperature sensor capable of detecting temperature of the heating elements and a second temperature sensor capable of detecting air temperature of the inner chamber are disposed in the inner chamber; the box is further provided with a control unit, and the control unit is electrically connected with the first blower, the second blower, the first temperature sensor and the second temperature sensor; and the control unit is used for controlling the first blower and the second blower to be started or stopped by receiving temperature information acquired by the temperature sensors (23, 24). a first end of the first air passage chamber is connected to an air inlet, a second end of the first air passage chamber communicates to a first blower chamber, and a first blower is disposed inside the first blower chamber; the first blower chamber is provided with an air outlet; and the air inlet, the first air passage chamber, the first blower chamber and the air outlet sequentially form a first ventilating path for realizing air flow in the first air passage chamber; the inner chamber comprises element regions and a cavity region, and heating elements are disposed in the element regions, wherein each of two sides of the first air passage chamber is provided with one of the element regions respectively; the cavity region comprises the element regions, the cavity region surrounds the whole first air passage chamber; a second blower is disposed in the inner chamber and is used for enabling air in the inner chamber to flow to form a second ventilating path; a first heat radiating fin is disposed between each of the element regions and the first air passage chamber, and the first heat radiating fin is exposed in the first air passage chamber; a second heat radiating fin is disposed between the cavity region and the first air passage chamber, and the second heat radiating fin is exposed in the first air passage chamber; the second heat radiating fin is provided both at an upper side and a lower side of the first air passage chamber; both the first heat radiating fin and the second heat radiating fin are provided on opposite sides of the first passage chamber; a first temperature sensor capable of detecting temperature of the heating elements and a second temperature sensor capable of detecting air temperature of the inner chamber are disposed in the inner chamber; the box is further provided with a control unit, and the control unit is electrically connected with the first blower, the second blower, the first temperature sensor and the second temperature sensor; and the control unit is used for controlling the first blower and the second blower to be started or stopped by receiving temperature information acquired by the temperature sensors (23, 24).