The invention discloses a heating film and a preparation method thereof, a device adopting the heating film and a preparation method for the device. The heating film comprises a plurality of layers ofgraphene and carbon fibers. Specifically, the heating film comprises 0.1-5 parts by weight of the graphene, 60-80 parts by weight of the carbon fibers, 3-5 parts by weight of a bamboo paper pulp, 0.5-1 part by weight of a dispersing agent, 0.2-0.5 part by weight of a coupling agent, and a defoaming agent. The heating film provided by the invention has high safety, reliability, uniqueness and practicability; compared with a traditional metal heating material, the heating film provided by the invention can save energy by 30% or above; meanwhile, heating films provided by the invention can be intransverse connection and longitudinal connection with one another; a single heating film can reach a width of 1 meter and can be normally used under a power supply with a voltage of 36 VDC, which isunreachable for the traditional metal heating material; meanwhile, the heating film can continuously reach a surface temperature of 50 DEG C under the power supply with the voltage of 36 VDC, has high carbon content, is not prone to oxidation, can be continuously used for a long time, only has a service life attenuation rate of 1.7%, and can reach a heat utilization rate of about 99.8%.