In the digital age， more and more digital platforms realize the construction of value co-creation organizations through boundary crossing. Based on the boundary crossing theory， it refined the theoretical model of building a value co-creation organization by crossing the boundary of digital platform through a longitudinal case study of Zhubajie.com. It finds that the digital platform has gone through three stages of trust establishment， business expansion， and virtual and real integration， following the crossing path of “trust boundary-business boundary-virtual and real boundary”， and reflecting the action mechanism of “boundary identification-boundary crossing strategy-boundary crossing capability-value co-creation organization”. It reveals the internal mechanism of digital platforms building the value co-creation organization by boundary crossing， and the research conclusions have good enlightenment for platform organization innovation in the digital economy era.