In the context of deep aging society, urban community parks, as frequent places for daily activities of the elderly, require improvement in their built environment and facilities to be more elderly-friendly. To address the limitations of existing evaluation research that only considers subjective or objective weighting evaluation models, this study proposes a fuzzy comprehensive nonlinear evaluation model for the elderly-friendliness of urban community parks based on a compromise weighting concept that integrates subjectivity and objectivity. The research constructs an evaluation index system for the elderly-friendliness of urban community parks based on the SERVQUAL model and RECITAL tool. The subjective weights are analyzed using the Analytic Hierarchy Process (AHP) based on questionnaire evaluation results of typical urban community parks in Mianyang City. Then, the variable weight fuzzy comprehensive evaluation method is introduced to compromise the subjective and objective weights, resulting in a comprehensive level of elderly-friendliness. The results show that the overall elderly-friendliness evaluation of community parks in Mianyang City is at a moderate level, with the dimensions ranked as follows: Empathy (80) > Reliability (75) > Assurance (74) > Perceptibility (71) > Responsiveness (69). The use of compromise weighting in the fuzzy comprehensive evaluation considers decision-makers’ preferences while reducing the subjectivity in weighting, resulting in reliable and realistic evaluation results. This approach can provide methodological references and ideas for evaluation issues in other planning and design domains.