The invention discloses a carbon-based porous flexible composite wave-absorbing material and a preparation method thereof. The carbon-based porous flexible composite wave-absorbing material and the preparation method thereof are characterized in that pretreatment is conducted on one part of a carbon-based wave-absorbing agent, and then mixing molding is conducted on the treated carbon-based wave-absorbing agent, 0.2-0.4 part of a fluxing agent, 40-100 parts of
silicone rubber, 10-30 parts of reinforcing agents, 0-5 parts of
radiosensitizer and 0-3 parts of
flame retardants; rubber materials molded through mixing are put into a mold, rolling is conducted on the rubber materials at 100-150 kg.cm<-2>, and a
thin sheet with the thickness
ranging from 0.5 mm to 5 mm is prepared; after plastic sealing is conducted on the
thin sheet with the mold, the plastic-sealed
thin sheet with the mold is put into a gamma-
ray irradiation field or an
electron beam accelerator to enable the total
absorbed dose to be kept at 30-100 kGy,
radiation crosslinking is conducted, after a plastic
package and the mold are removed, edges are
cut off, and the carbon-based porous flexible composite wave-absorbing material is obtained. According to the carbon-based porous flexible composite wave-absorbing material and the preparation method thereof, the technology is simple, complex
chemical process control or professional auxiliary equipment is not needed, only simple equipment such as a double-roller mixing mill is needed, and the cost is lower; the
prepared material is excellent in flexibility and wave-absorbing performance, the preparation process is easy and rapid to control, the
repeatability is good, and
energy conservation and environment protection are achieved.