This article mainly studies the effect of nanoligament combined with tennis on the rehabilitation of ligament injury patients. This article first uses nanoligaments made by ACL reconstruction technology to give targeted rehabilitation treatment to patients with ligament injuries, analyzes the internal structure of the knee joint cavity ligaments, and clarifies the rehabilitation of ACL injuries and other combined injuries. The construction method of nanoligament composite fiber composite ligament is mainly introduced. Secondly, the nanoligament damage mechanism can be used to prevent excessive knee deformation and internal rotation. Finally, the nanoligament is combined with the fiber composite ligament, and the silk fibroin filament yarn is used as the axis to form a composite structure on the fiber composite ligament structure to strengthen the rehabilitation effect for patients with ligament injury. In this study, combined with the data analysis of patients with nanoligament injury, it was found that after 50 patients have undergone corresponding tennis training and knee flexion angle observation, the recovery speed is 5 times faster than that of ordinary patients. The experimental results show that the combination of nanoligaments and tennis has a positive effect on rehabilitation training for patients with ligament injury.