The incorporation of metaverse technology in education, particularly within standardized state educational frameworks, holds promise for significant improvements in learning outcomes. This study aimed to assess the effectiveness of integrating an online metaverse platform into state educational services, thereby fostering the development of digital environments. A total of 278 students from middle and high school levels in China participated in the study. Academic achievement tests, alongside the Engagement Level Scale (ELS) and Motivation Level Scale (MLS), were employed as measurement tools. The utilization of the metaverse platform, hosting the state-approved curriculum for seventh and tenth grades, resulted in notable enhancements in students' academic performance, engagement, and motivation. Among seventh graders, the most significant improvements in academic performance were observed in mathematics (5.897), literature (5.101), and history (5.767). For tenth graders, enhancements were noted in Chinese language (7.500), literature (5.800), and chemistry (5.650). Moreover, improvements in engagement and motivation were statistically significant. Seventh graders in the experimental group exhibited higher levels of intrinsic motivation (6.45), extrinsic motivation (5.28), and self-regulation (7.18) compared to the control group. For tenth graders, the respective increases were 5.70, 4.00, and 4.65 for each subscale. The practical and scientific significance lies in demonstrating the potential of enhancing educational outcomes and student motivation through the implementation of an online metaverse platform, which could be integrated into state school curricula.