With the world's population aging, Alzheimer's disease has attracted more and more attention as a common elderly disease. The clinical manifestations of cognitive function decline in Alzheimer's disease are mainly memory decline, which will seriously damage the patient's sense of self-worth. The purpose is to use the method of song recall to conduct individual music therapy intervention for Alzheimer's disease patients, to help Alzheimer's disease patients activate autobiographical memory, trigger positive emotions, improve behavioral symptoms, and delay the development of the disease. This paper proposes to combine computer vision technology with music therapy to obtain relevant data before and after intervention through the literature method, measurement method, case study method and experimental method. It helps AD patients to improve and slow down the forgetting and confusion of autobiographical memory, thereby enhancing the mood and cognition of AD patients. It observes the changes of AD patients before and after intervention by song recall and provides new ideas and practical basis for the application of music therapy in the field of Alzheimer's disease research. The experimental results showed that the subjects' autobiographical memory test (AMT) after 16 sessions of music therapy, from 12 points before the test to 14 points after the test. The scores were significantly positively correlated, and the improvement of autobiographical memory could improve the patient's orientation and memory.