The invention discloses a weather-resistant flexible data cable for communication. A first sheath layer of the flexible data cable wraps the outer surfaces of two copper conductors, and a second sheath layer wraps the outer surfaces of steel wires. The first sheath layer consists of a polyvinyl chloride layer located on the inner side and a thermoplastic polyurethane layer located on the outer side. The thermoplastic polyurethane layer consists of thermoplastic polyurethane elastomer 80-100 parts, low-density polyethylene 10-20 parts, ethylene acrylic ester 8-15 parts, ethylene-butylene copolymer 5-10 parts, silicon dioxide 4-8 parts, butyronitrile compound 8-20 parts, chlorinated polyethylene 5-10 parts, zinc stannate 5-15 parts, magnesium hydroxide 5-12 parts, compound molybdenum smoke suppression agent 2-8 parts, montmorillonite 1-5 parts, calcium-zinc compound stabilizer 1-3 parts, bi (3,5-tert-butyl-4-hydroxycyclohexyl phenyl ketone) thioether 1-3 parts and zinc stearate 2-4 parts. The weather resistance and flame retardant property of the weather-resistant flexible data cable for communication are improved, meanwhile a laying phenomenon is also avoided, the contact surface consistency and bonding fastness of the polyvinyl chloride layer and the thermoplastic polyurethane layer are improved, the performance reliability of a product is improved, and the service life of the product is prolonged.