The invention discloses carbon fluoride prepared by carrying out heating reaction of bamboo charcoal and a fluorination reagent in a closed container. A preparation method of carbon fluoride is characterized by heating bamboo charcoal and the fluorination reagent in the closed container for 1-20 h to obtain carbon fluoride, wherein the fluorination reagent is NF3, and the reaction temperature of the heating reaction is 300-600 DEG C. In addition, the invention further discloses an application of the carbon fluoride in being used as a lithium primary cell cathode material. The preparation method of the carbon fluoride has the advantages of simple process, high specific capacity and good safety. A lithium primary cell prepared by using the carbon fluoride provided by the invention has high working voltage platform, the discharge voltage of lithium-carbon fluoride is raised to 3.0V which is higher than the discharge voltage being 2.5V of lithium-graphite fluoride, thus the energy storage capacity of the lithium primary cell can be raised by about 20%.