With the rapid development of Internet and new media technology, publishing industry faces new development opportunities. VR/AR children's books, as a new reading medium for children under the media convergence of 5G era, bring children a brand new reading experience through the organic combination of "virtual and reality". However, there exist such problems as poor interaction effect, single form and weak immersion experience, etc. This paper made a comprehensive analysis on the advantages of children's book reading immersion experience from the perspective of media convergence. Through wonderful creativity, exquisite design and operation, it perfectly combined culture, art and technology to realize the "paper media + multi-media" reading form of mutual penetration and fusion of virtual scene and reading reality to enable children to get a wonderful immersive experience when reading. The research on the immersive reading experience of children's books will promote the rapid development of children's book publishing, accelerate the integration of media, provide readers with richer digital reading products and services, and meet people's new needs for spiritual culture and lead a better life in the new era.