Objective: To analyze the effect of limb exercise training combined with continuous passive activity (CPM) on functional recovery after total knee arthroplasty (TKA). Methods: 110 patients with TKA in our hospital from December 2018 to December 2019 were selected and randomly divided into observation group and control group with 55 cases in each group. The control group received CPM training after operation, while the observation group received limb exercise training on the basis of control group training. The knee score and function score of the two groups before and after training were compared, and the clinical efficacy and Daily exercise life score (ADL) score were statistically analyzed. Results:(1) Before training, there was no significant difference in knee joint pain, range of motion and stability, muscle strength, walking and walking ability between the two groups (P > 0.05), After training, the knee joint pain score of the observation group was lower than that of the control group, and the scores of activity, stability, muscle strength, walking ability and walking ability of the observation group were higher than those of the control group (P < 0.05). (2) After training, the total effective rate of the observation group was higher than that of the control group (P < 0.05). (3) After training, the ADL score of the observation group was higher than that of the control group (P < 0.05). Conclusion: After TKA, limb exercise training combined with CPM can relieve pain, improve joint function, improve clinical efficacy, and improve the quality of life of patients.