The present invention discloses a vacuum freeze drying method of wild cordyceps sinensis, which pertains to the field of medicinal materials processing. The preparation steps are that: collection of fresh cordyceps sinensis arrow preparation of color protecting reagent arrow color protection arrow prefreezing arrow vacuum freeze drying arrow final product of the cordyceps sinensis arrow packaging and preservation. Cordyceps sinensis dried by adopting the invention can maintain the original physical activity to the maximum, thus enabling a variety of natural functional elements contained in the cordyceps sinensis to be protected to the maximum during the drying process, which can not only maintain the natural shape unchanged basically, but can also improve the organoleptic quality, thereby solving the technical barriers of the poor organoleptic indicators and difficult preservation of the functional elements of the cordyceps sinensis after drying. The product obtained has stable quality and safety, which realizes the value increase of the cordyceps sinensis and has huge economic benefits and market development prospects.