Disclosed are a flame retardant outer tube and a production method thereof. The raw materials of the flame retardant outer tube include, by weight: 95 to 100 parts of polyvinyl chloride, 45 to 53 parts of dioctyl phthalate, 1.6 to 3.5 parts of calcium-zinc complex stabilizer and 4 to 17 parts of matt powder. After the raw materials are prepared, the flame retardant outer tube is obtained by mixing the raw materials, granulating and extruding. The flame retardant outer tube is capable of resisting high temperature and operating normally at high temperature, the fine low-temperature softness is provided, and the high bending and stretching strengths are provided.