Portable refrigeration system

The portable freezing system comprises a working part, a transmission device, a storage device and a shell. And the working part and the storage device are connected together through the transmission device. The transmission device and the miniaturized storage device are arranged in the shell, and the storage device is used for storing a refrigeration source. And the transmission device transmits the low temperature formed by the refrigeration source stored in the storage device to the working part for low-temperature cryotherapy. The working temperature of the working part can be controlled by adjusting the heat exchange area of the working part and the transmission device. Due to the fact that the storage device is the miniature storage device arranged in the shell, on the premise that the clinical use amount requirement is guaranteed, the portable freezing system can be miniaturized and designed into a pen-shaped freezing therapeutic instrument or a therapeutic pen capable of being held by one hand, and cl