The core is equipped with an efficient on-board dedicated refrigeration unit, which supports the selection of domestic or imported units of different brands and powers. The refrigeration temperature can flexibly cover -15 ℃ to 15 ℃, which can achieve the preservation and refrigeration of fruits, vegetables, and dairy products (0 ℃ to 15 ℃), as well as the low-temperature transportation of small frozen goods (-5 ℃ to -15 ℃). It is suitable for the diversified needs of short distance cold chain transportation, and can flexibly adjust the temperature according to the characteristics of the goods, effectively locking the freshness of the goods and avoiding deterioration caused by temperature fluctuations during short distance distribution. The refrigeration unit operates stably, has high cooling efficiency, can quickly reach the set temperature and maintain a constant temperature, while also considering energy efficiency. With excellent insulation performance, it further reduces energy consumption and meets the economic needs of small cold chain transportation. It can also be equipped with electrical devices, heating devices, or dual temperature units according to demand to improve adaptability. The refrigerated compartment body is manufactured using vacuum adsorption and hydraulic adsorption integrated molding technology. It is a fully sealed sandwich composite structure with insulation performance that meets the national A-level standard. It can effectively block external temperature conduction, reduce refrigeration energy consumption, and ensure constant temperature inside the compartment during short distance distribution. The interior and exterior panels of the car body are made of high-quality glass fiber reinforced plastic, which is non light absorbing, good heat insulation, strong hardness and oxidation resistance. The middle insulation layer is XPS extruded polystyrene board or polyurethane foam board. The car body is 80mm thick, and has excellent sealing performance; The bottom of the compartment is equipped with aluminum alloy anti slip patterned plates, which are easy to clean and anti slip and wear-resistant. The door edge strips are made of labyrinth rubber sealing strips, matched with stainless steel door lock hinges, door frames and hinges, completely eliminating air conditioning leakage. The compartment is equipped with energy-saving LED lighting, which is convenient for checking the situation inside the compartment when loading and unloading goods. The top of the compartment is closed and cannot be opened, further enhancing the insulation effect.