Against the backdrop of declining motivation and growing social and emotional challenges in English learning experienced by Hong Kong primary school students, the study aimed to profile an interactive pattern between relevant motivational beliefs (i.e., self-efficacy, interest, and growth mindset), social and emotional learning (SEL) skills and English learning achievements. Data was collected from 913 4th graders with questionnaires and an English test. Results indicated a medium-high level of motivation among the participants, and a high level of self-awareness and social awareness skills but a medium level of self-management and social management skills in terms of SEL. More importantly, structural equation modeling (SEM) analyses confirmed the intricate interplay where the motivational beliefs predicted English learning achievements through the mediation of self-awareness and self-management skills. Our findings also underscore the relatively higher importance of interest and growth mindset than self-efficacy in English learning for young children. Pedagogical implications are discussed.