The invention discloses a litchi fresh-keeping method, and belongs to the technical field of storage and fresh-keeping of fruits and vegetables. The litchi fresh-keeping method comprises the following steps: soaking cleaned litchis in Sportak, then performing soaking in sodium nitroprusside, spraying a vegetable gum solution on the surfaces of the litchis, then carrying out heat treatment, and storing the litchis in a low-temperature closed environment. According to the fresh-keeping method, the low-temperature storage time of the litchis is prolonged to the maximum extent, loss of moisture of the litchis is reduced, generation of malonaldehyde and hydrogen peroxide in the litchis is reduced, the activity of superoxide dismutase in the litchis is improved, rotting and browning of the litchis are effectively prevented, the fresh-keeping effect is good, chemical substances such as sulfur are not contained, the preserved litchis are good in taste, green and environment-friendly, and the preservation process is simple and easy to popularize.