The invention provides a preparation method for a fluorine-doped graphene material and belongs to methods for preparing fluorine-doped graphene through high-temperature carbonization. The method comprises the following steps: a fluorine-containing high polymer material is put into a corundum crucible and placed inside a high-temperature reaction container,and under a certain gas atmosphere, sintering is performed for 1 to 8 hours under the condition of 300 to 900 DEG C according to a specific temperature rate, so that a fluorine-doped graphene product is obtained. The fluorine-containing high polymer material is adopted as a raw material, and the fluorine-doped graphene material is prepared through a one-step high-temperature carbonization method, the used raw material is low in cost and easy to obtain, the preparation steps are simple, the operation controllability is high, the obtained product mainly comprises fluorine-doped graphene with low slice number (2 to 10 nanometers), and large-scale industrial production is easier. In addition, the production is performed under the environment of non-oxidizing atmospheres through the method, the content of oxygen in the target object of graphene can be effectively reduced, and the fluorine-doped graphene material has high potential for being used widely in the fields of new-energy lithium ion batteries, catalysis, optics, electrochemistry and the like.