Objective: To investigate the effect of muscle isokinetic training with visual biofeedback on knee joint muscle strength, proprioception and joint function in patients with meniscus injury after arthroscopic surgery. Methods: A total of 150 patients who underwent the first arthroscopic surgery in Qingdao Special Service Rehabilitation Center, PLA Navy from July 2019 to December 2021 were randomly divided into control group (n=75) and observation group (n=75). The control group received routine rehabilitation training after operation, and the observation group received muscle isokinetic training with visual biofeedback on the basis of routine rehabilitation, rehabilitation treatment lasted for 3 months in both groups. Before and after rehabilitation treatment, knee function was evaluated by The Pedi International Knee Documentation Committee (IKDC) and Lysholm score, and knee muscle strength and proprioception (mean trajectory error and mean weight-bearing strength difference) were compared between the 2 groups. Results: The excellent and good rate of the observation group was 78.67%, which was higher than 61.33 % of the control group, and the difference was statistically significant (P<0.05). After treatment, the IKDC and Lysholm scores in the observation group were higher than those in the control group, and the difference was statistically significant (both P<0.05). After treatment, the peak force distance of knee flexion and extension in the observation group was significantly greater than that in the control group (both P<0.05), and the average trajectory error and average weight bearing force difference were significantly less than those in the control group (both P<0.05). Conclusion: Muscle isokinetic training with visual biofeedback can improve the muscle strength and proprioception of knee joint in patients with meniscus injury after arthroscopic surgery and promote the recovery of knee joint function, which is an effective postoperative rehabilitation training method.