Self-regulated learning serves as a fundamental framework for understanding the cognitive, motivational, and emotional dimensions of learning. Recently, a growing body of studies on such cognitive processes appears in multilingual populations. Applying a mixed-methods approach, this study examined the key components of the self-regulated learning process among 233 multilingual international students in China, specifically within the context of English as a Foreign Language learning. Qualitative data was analyzed through Pearson's correlation analysis, structural equation modeling, and path analysis, while semi-structured interviews were conducted to further confirm the results of the qualitative data analysis. 15 students were purposefully selected through purposive sampling to participate in follow-up interviews. Within the framework of social cognitive theory, the findings revealed that metacognition, motivation, self-efficacy, and feedback loops are the primary components of self-regulated learning. Additionally, path analysis confirmed that the four factors are positive predictors of self-regulated learning proficiency of multilingual international students in China. The interview outcomes further validated the integral role of these primary components in the self-regulated learning process within the context of multilingual study. This study underscores the significance of incorporating translanguaging backgrounds into teaching strategies and language policy. Findings may offer some insights for multilingual international students, language teachers, and language policymakers in the field of Chinese language instruction.