The utility model provides a vehicle small-type refrigerating and heating device, and relates to refrigerating and heating devices. The vehicle small-type refrigerating and heating device comprises a refrigerating box, a heating box, a semiconductor refrigerating chip, a heat exchanger, temperature sensors, a microprocessor, a PID controller and an adjustable power module. The refrigerating box and the heating box are mutually connected, the semiconductor refrigerating chip is arranged between the refrigerating box and the heating box, and the heat exchanger is connected between an air supply outlet and an air return outlet of the heating box. The heat exchanger is further connected with the two ends of a vehicle engine water heating system respectively, the temperature sensors are arranged in the heating box and the refrigerating box respectively and are connected with the input end of the microprocessor, the output end of the microprocessor is connected with the input end of the PID controller, the output end of the PID controller is connected with the adjustable power module, and the output end of the adjustable power module is connected with the semiconductor refrigerating chip. Heat generated by an engine is mainly used as the heat source in the heating box. The refrigerating box achieves refrigerating through the semiconductor refrigerating chip. The microprocessor and the PID controller are used for improving the refrigerating efficiency of the refrigerating box, and high-efficiency energy utilization is achieved.