Objective To explore the pain catastrophizing (PC) level of pain in patients with multiple fractures and its influencing factors. Methods Eighty patients with mandibular fracture were selected and randomly divided into control group and observation group, with 40 cases in each group. The control group was conducted with routine postoperative nursing measures, while the observation group was conducted with additional evidence-based nursing intervention. The recovery status, incidence of postoperative complications, mental health status, and nursing satisfaction degree were analyzed in both groups. Results The wound healing time was (7.90±4.21) days in the observation group and (9.43±4.29) days in the control group; the recovery efficiency of chewing function was (79.19±4.74) % in the observation group and (73.28±4.78) % in the control group; the incidence of complications was 7.5% in the observation group and 27.5% in the control group; the score of the Hamilton Anxiety Scale (HAMA) at 6 months after surgery was (10.76±1.65) points in the observation group and (13.99±1.43) points in the control group; score of the Hamilton Depression Scale (HAMD) at 6 months after surgery was (11.78±1.26) points in the observation group and (12.49±1.29) points in the control group; all the between-group differences mentioned above were statistically significant (P<0.05). Conclusion Evidence-based nursing can promote the postoperative recovery of patients with mandibular fracture, reduce the incidence of postoperative complications, alleviate patient's psychological stress, and increase nursing satisfaction degree.