A fresh-keeping device, a cold-chain transportation apparatus, a cold-chain system, and a product pricing method. The fresh-keeping device comprises a body (11), a first pipeline (12), and a second pipeline (13); the body is provided with a control means (112), an input means (113), and a refrigerating means (111); one end of the first pipeline and one end of the second pipeline are both communicated with a packaging box (20), and the other end of the first pipeline and the other end of the second pipeline are both connected to the refrigerating means to form an airflow loop between the packaging box and the refrigerating means; and the input device is used for generating fresh-keeping control information according to input logistics information, and the control device is used for controlling the refrigeration device to operate according to the fresh-keeping control information. According to the solution, real-time and intelligent cold chain fresh-keeping can be achieved, so that the freshness of products is guaranteed, and the sales of the product are promoted.
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