The invention relates to a carbon flexible conductive film and a preparation method thereof. The carbon flexible conductive film comprises TPU and a carbon material. The carbon flexible conductive film is characterized in that the mass ratio of the carbon material to TPU is 1: 250 to 1: 50, the carbon material comprises a first component and a second component, the first component comprises graphene and/or reduced graphene oxide, the second component comprises one or more of graphite, conductive carbon black and carbon nanotubes, the ID/IG value of the Raman spectrum peak of the first component is A, the ID/IG value of the Raman spectrum peak of the second component is B, and the absolute value of the difference between A and B is less than or equal to 0.4. The carbon-based flexible conductive film provided by the invention uses less carbon material, the dispersion process is relatively simple, the conductivity can be as low as 10<-4> ohm.m, and the final product meets the anti-staticperformance requirement and the conductive performance requirement in GBT 15662-1995 that the volume resistivity is lower than 10<6>ohm.m, and can be applied to flexible electronic devices.