The invention discloses a thermal management system and a new energy automobile with the same, and relates to the technical field of automobiles. According to the thermal management system, a batterycompartment and an air conditioning system are thermally coupled together, a heat exchanger is arranged in the battery compartment, and multi-stage cooling is formed among the air conditioning system,the battery compartment and the heat exchanger; and a cooling medium obtains the cooling capacity from the air conditioning system and sends the cooling capacity into each battery box in the batterycabin, and the cooling medium in the battery box cools the battery units of the battery box by utilizing the cooling capacity obtained from the air conditioning system, exchanges heat with the heat exchanger in the battery cabin and finally leaves the battery cabin. According to the battery and the new energy automobile related to the thermal management system, heat exchange in the power battery box is enhanced by utilizing an energy step principle, the temperature constancy in the battery box and the battery cabin is maintained to the greatest extent, the cycle life of the power battery is prolonged, the energy efficiency of the thermal management system is improved, and the energy efficiency of the whole automobile is further improved.