The invention discloses a radio frequency line polyvinyl chloride cable material and a preparation method thereof. The radio frequency line polyvinyl chloride cable material comprises following components in parts by weight: 80 to 120 parts of polyvinyl chloride, 30 to 50 parts of a cold resistant plasticizer, 10 to 50 parts of a high temperature resistant plasticizer, 20 to 40 parts of a flame retardant plasticizer, 7 to 10 parts of a high efficient environmentally friendly calcium-zinc stabilizer, 90 to 125 parts of a flame retardant, 5 to 10 parts of chlorinated polyethylene, 20 to 30 partsof a filling material, 0.5 to 1.5 parts of a charring agent, and 0.5 to 1.5 parts of polyethylene wax. The provided radio frequency line polyvinyl chloride cable material has a better high/low temperature resistant performance and a better flame retardant property, can tolerate a low temperature of -40 DEG C and a high temperature of 80 DEG C, reach a VW-1 flame retardant grade, can be used to prepare RG-174 radio frequency lines or similar radio frequency lines, solves the problem that radio frequency lines cannot be used at a low temperature, enlarges the application range of radio frequency lines, has more stable properties, and meets high user requirements.