Based on the rapid development of unmanned aerial vehicles (UAV), especially in the inspection of national power network. The inspection of the UAV transmission line can accurately find the fault point to ensure the stable operation of the system. According to the interference in the inspection of UAV, the anti jamming subsection coding scheme is adopted. This paper proposes a method based on cognitive OFDM, which is based on a low redundancy optimization design method. The anti interference segment coding scheme can recover the lost packets through the dual parity packets and avoid the interference of the main users of the cognitive user communication process. The experimental results show that the proposed scheme has lower frame error rate and higher throughput performance than the uncoded scheme, which improves the antijamming performance of uav.