With a rapidly aging population in China, resocialization is a concern amidst an increasing influx of older adult migrants. The aim of the current study was to develop a resocialization assessment scale for older migrants within the Chinese context. The study was conducted in two phases. A literature review and qualitative interview were performed to generate a draft scale that was further examined through Delphi expert consultation. Participants comprised 509 older migrants selected for a questionnaire survey. Analysis identified 62 items across four factors: interpersonal relationships, behavioral patterns, cultural integration, and social roles. Reliability and validity of the resulting assessment scale were verified. The scale can be used to evaluate the degree of resocialization exhibited by older migrants in Chinese communities. [Research in Gerontological Nursing, 15(5), 245-253.].