Objective: To explore the relationship between social isolation, psychological resilience, and psychological well-being in community-dwelling older adults. Methods: A questionnaire survey was conducted with 265 community-dwelling older adults using the Social Isolation Scale for the Elderly (C-SIS), the 10-item Brief Psychological Resilience Scale, and the Comprehensive Happiness Questionnaire (MHQ). The results were statistically analyzed using SPSS 27.0. Results: The highest score on the Social Isolation Scale for Community Elderly was 23, with a mean entry score of 2.36 ± 0.62. A score of 14 was the cut-off point, with scores of ≤ 14 classified as social isolation. There were 136 cases with scores below 14, resulting in a social isolation incidence rate of 51.3%. The median (P50) psychological resilience score was 27, indicating a higher level of resilience. The total score on the Psychological Well-being Scale was 161, suggesting a moderate to slightly higher level of well-being. Social isolation had a direct negative effect on psychological well-being, while psychological resilience had a positive effect. Conclusion: Older adults should be supported in reducing the incidence of social isolation and increasing psychological resilience to enhance psychological well-being and promote successful aging.