The invention relates to a fresh-keeping method for a lotus rhizome. The method comprises the following steps: after harvesting of the lotus rhizome, cleaning the lotus rhizome in a shady and cool environment, then discarding nodes of the lotus rhizome and cleaning the lotus rhizome again; disinfecting the lotus rhizome in an aqueous solution of chlorine dioxide, draining the lotus rhizome and immersing the lotus rhizome in a coating agent for coating, wherein the coating agent is composed of sterile water, citric acid, chitosan and ultramicro horseshoe peel powder; and taking out and draining the lotus rhizome, carrying out vacuum aseptic packaging in 20 to 30 min and storing or transporting the packaged lotus rhizome in a shady and cool environment with a temperature of 2 to 10 DEG C, wherein selling of the packaged lotus rhizome can be carried out at normal temperature. According to the invention, any composition substance harmful to a human body is not added; when browning prevention technology is applied, water chestnut starch is added for bacteriostasis, so the purpose of retaining freshness of the lotus rhizome is achieved. With the method provided by the invention, the lotus rhizome has high security, good taste, a good color, a good shape and abundant nutrients, unique brittleness and the unique color of the lotus rhizome can be retained to a greatest extent, long-time marine transport of the lotus rhizome can be realized, and the lotus rhizome is rich in nutrients and convenient to carry and store, has a storage life of 4 to 5 months and can meet demands for ocean transportation of the lotus rhizome for exports.