Objective: To explore the application of rehabilitation nursing based on motivation behavior transformation in patients with ulnar and radial fractures. Methods: The prospective randomized trial was conducted in 100 patients with ulnar and radius fractures admitted to our department from September 2019 to September 2020. Patients meeting inclusion criteria were randomly divided into the observation group and the control group, with 50 cases in each group. The control group was given routine nursing, and the observation group was given rehabilitation nursing of motivation behavior transformation on the basis of the routine nursing. The rehabilitation enthusiasm, recovery of forearm function and complications were compared between the two groups. Results: The postoperative rehabilitation enthusiasm and forearm function score (HSS) after 2 weeks of the observation group were higher than those in control group, with statistical significance (P<0.05). The total incidence of postoperative complications such as joint adhesion, nerve paralysis and dysfunction in the observation group was lower than that in the control group, with statistical significance (P<0.05). Conclusion: Rehabilitation nursing based on motivation behavior transformation can improve the rehabilitation enthusiasm of patients with ulnar and radial fractures, promote the recovery of forearm function after operation, and reduce postoperative complications.