The present invention discloses a jacket type hybrid electric vehicle battery device with a liquid cooling system, comprising a battery module box top cover, a battery module, a battery module box, a casing type evaporator, a water pump, a temperature control triple valve, an electric heating device, a liquid separating head and a cooling pipeline. The battery device adopts a liquid cooling jacket type structure, i.e. a cooling shell is arranged outside a battery matrix; the device can realize the effective temperature reduction of the whole battery module of an electric vehicle in the severe thermal environment, and can also satisfy the even temperature distribution among battery bodies, so as to achieve the optimal operation condition of the vehicle, which prolongs the life-span of the batteries and improves the power performance of the hybrid electric vehicle at the same time. The casing type evaporator is selected as a heat exchanger, and as the evaporator is characterized in light weight, compact structure, high heat exchange efficiency, etc., the battery device is simpler and more portable. The electric heating device is arranged according to the work of the hybrid electric vehicle battery in the cold environment.