The increasing prevalence of mental health disorders among children, exacerbated by the COVID-19 pandemic, calls for innovative educational approaches and tools. Traditional mental health curriculum in Chinese elementary schools often rely on didactic methods that fail to engage students effectively. The “Mind Explorers” digital learning platform addresses this issue by enhancing mental health awareness among grade-2 students. Based on the ADDIE instructional design model and Biggs’ Constructive Alignment model, the platform integrates learning outcomes, content, activities, and assessments via Google Site. The sample unit “Know About Yourself” focuses on self-awareness and emotional regulation through storytelling, reflective activities, and interactive quizzes. Expert evaluations indicate positive reception of the platform’s content, usability, and educational alignment, with suggestions for enhancing design aesthetics and accessibility. Through a mixed-methods research design, this study underscores the potential of digital tool to transform mental health education, promoting engaging and effective learning experiences for young learners.