In order to solve the quality management problems of large-scale landscaping projects in high-density urban areas under rigid construction periods and multi-disciplinary cross construction conditions, this article adopts refined management methods, constructs a multi-disciplinary collaborative interface management mechanism, innovates the off-season seedling preservation technology system, applies ecological materials and resource recycling processes and other strategies, and implements full cycle dynamic control. Practice has shown that the combination of scientific construction organization design and BIM technology 4D simulation can effectively shorten the process connection time. Customized maintenance pre plan improves the survival rate of large-sized trees. The resource utilization of construction and landscaping waste reduces material costs and provides a feasible technical path for the refined management of landscaping projects in urban core areas.