Aiming at the multi access problems of cooperative task measurement and control transmission of UAVs, high- dynamic SC-FDMA technology based on distributed task allocation model is proposed. By combining greedy principle, dynamic channel allocation mechanism and multi-user access technology, a mapping rule with adjustable number of subcarriers is designed by centralized mapping, and the number of subcarriers occupied by each UAV node is configured. The simulation results show that the data link of one-station multi-UAVs based on SC-FDMA has more balanced performance in terms of peak-to-average ratio, bit error rate, band efficiency, and reconstruction time compared to the traditional FDMA, CDMA, TDMA, OFDMA, etc. It can improve the reliability, real-time performance, security and stability of the system, and effectively unify the task allocation, channel environment and link state, which is more suitable for star network interconnection UAVs in air ground time-varying channel.