To systematically review the current research on suicide among older adult cancer patients, this study examines its epidemiological characteristics, multi-dimensional influencing factors and their interactions, assesses the effectiveness of existing intervention strategies, and provides a foundation for future research and clinical practice recommendations.By synthesizing relevant literature, we summarize risk factors and effective interventions related to suicide in this population. Older adults with cancer are at high risk for suicide, influenced by factors such as cancer type and stage at diagnosis. These risk factors span biological, psychological, and social domains, interacting through a biopsychosocial model to collectively contribute to suicide risk.Palliative care shows promise in indirectly reducing suicide risk, and digital health interventions may offer potential, though more evidence is needed. However, there is a notable lack of interventions directly targeting suicidal ideation. Current research on suicide among older adult cancer patients faces challenges including imprecise data, limited understanding of underlying mechanisms, and insufficient intervention evidence. It is recommended to establish standardized data monitoring and sharing systems, carry out longitudinal cohort studies, and develop multimodal preventive intervention programs to create a safety net and reduce suicide risk in this population.