Objective To analyze the value of standardized cognitive-behavioral intervention in health belief model intervention for elderly patients with chronic diseases. Methods A total of 150 elderly patients with chronic diseases (all diabetes combined with hypertension) were selected from the physical examination center of Community Health Service Center from October 2022 to October 2023. They were randomly divided into 2 groups with 75 cases in each group. The control group implemented the conventional intervention mode, and the observation group implemented the standardized cognitive behavior intervention of the health belief model intervention. Comprehensive evaluation was conducted based on four aspects: health belief, self-management efficacy, health behavior and compliance rate. Results After intervention, the scores of health belief Scale, Chinese version of General Self-efficacy Scale (GSES) and Chinese version of Health Promotion Lifestyle Scale (HPLP-C) were increased in both groups compared with before intervention (P<0.05), and the above scores in the observation group were higher than those in the control group (P<0.05). The rates of blood glucose control, blood pressure management, scientific diet, reasonable exercise, smoking cessation and correct medication compliance in two groups were higher than those in the control group (P<0.05). Conclusions The standardized cognitive behavior intervention of health belief model can enhance the health belief and self-management efficacy, promote the development of health behavior, and improve the compliance rate of elderly patients with chronic diseases.