The invention relates to a marine inflaming retarding rubber sealing material with low friction factor and a preparation method thereof. The marine rubber sealing material with a low friction factor comprises a crude rubber substrate, an inflaming retarding system, carbon black, a filling agent, a vulcanizing agent and a vulcanization accelerator, wherein the crude rubber substrate is oil-extended EPDM (ethylene propylene diene monomer), and the main effective element of an inflaming retarding system is a halogen-antimony inflaming retarding agent. During the forming process, the oil-extended rubber thinly passes through two rollers of an open mixing mill or an internal mixer repeatedly, and then the oil-extended rubber and the other materials are sequentially added, are uniformly mixed in proportion and remain still in the open mixing mill or the internal mixer; the rubber mixture is added into a single screw extruder to be continuously extruded and is heated and shaped indirectly in a vulcanizing boiler, the vapor pressure and time are respectively 0.5+/-0.05 MPa and 120+/10 Min. Teflon solution and tetrafluoroethylene powder are mixed uniformly with absolute ethyl alcohol, and then the mixture is sprayed on the surface of cross-linked rubber, and after heating and solidification, the ship-used inflaming retarding rubber sealing material with the low friction factor is obtained. The inflaming retarding rubber sealing material is applied to rubber sealing products on a transport ship, and has extremely low friction factor and good inflaming retarding performance.