The invention discloses a flame-retardant TPE sheath material, and a preparation method and an application thereof, and belongs to the technical field of halogen-free flame-retardant materials. The flame-retardant TPE sheath material is prepared from, by weight, 25-30 parts of SEBS, 8-12 parts of POE, 8-12 parts of polypropylene, 20-30 parts of an organic flame retardant, 5-10 parts of a flame retardant synergist, 3-5 parts of a scratch-resistant agent, 0.1-0.3 part of an antioxidant, 10-15 parts of filling oil, 1-3 parts of a processing aid, and the balance of deionized water. The TPE sheathmaterial developed in the invention has the characteristics of high flame retardant property, scratch resistance, no precipitation, high weather resistance, good mechanical properties, stress fatigueresistance, weather aging resistance and other excellent properties, can effectively solve the contradiction between flame retardancy and physical and mechanical properties in the existing halogen-free flame-retardant TPE sheath materials, can be well used as a new energy electric vehicle charging pile cable material, and has great market application and promotion values.