The invention discloses an application of longan fresh-keeping paper. The longan fresh-keeping paper is formed through sequentially packaging a base material, a coating and loading layer, an SO2 releasing agent and a packaging material, the base material and the packaging material are made of breathable and permeable materials, and the coating and loading layer is selected from an acrylate pressure-sensitive adhesive, a non-setting adhesive and a 3M adhesive; and the SO2 releasing agent is formed through mixing a main release agent with a release accelerant according to a mass ratio of 1:0.10-0.25. When the longan fresh-keeping paper is used, fruits are covered with the fresh-keeping paper, water vapor goes through the packaging material at the top of the fresh-keeping paper and enters the fresh-keeping paper in the fruit fresh-keeping process, the releasing agent absorbs water and then releases SO2, and the density of SO2 is greater than the density of air, so released SO2 sinks, uniformly diffuses in a fruit pile from top to bottom, and is uniformly absorbed by the fruits; and when the fresh-keeping paper is used to carry out fresh keeping, the good fruit rate of fruits stored at 1-5DEG C for 30d is 90-100%, and the shelf life in a 15-25DEG C air conditioning room is 3-5d.