The invention provides a high flexible cable for a photovoltaic system. The composition or composition modes of each structural layer is adjusted and improved based on a structure of the cable. A filling layer material combines glass fiber, a flame retardant, carboxymethyl cellulose, a crosslinking agent, a plasticizer, polytetrafluoroethylene, polyamide wax, mullite powder and anti-aging composition, the weight ratio among the glass fiber, the flame retardant, the carboxymethyl cellulose, the crosslinking agent, the plasticizer, the polytetrafluoroethylene, the polyamide wax, the mullite powder and the anti-aging composition is reasonably allocated, and the prepared cable has excellent flexibility and flame retardancy. The structure of the cable is further improved and innovated. Stabilizing devices are correspondingly arranged between a cable core and an insulating layer and between the filling layer and a sheath, and the strength, toughness and service life of the cable are improved. The cable with the performances of high flexible, anti-aging and flame retardant is prepared by the organic combination of the insulating layer, the filling layer and a sheath structure.