Three-dimensional modeling is the foundation of graphic expression and virtual reality of digital landscape. This article explores key technologies, methods and applications of three-dimensional modeling of virtual plant in digital landscape; and classifies into manual modeling technology, program generation technology, software automatic generation technology, measurement-based reconstruction technology. Researching the visual simulation of landscape plant elements with three-dimensional modeling theories of computer graphics, the main purpose is to provide three-dimensional expression for landscape design and landscape planning with theoretical guide, as well as to promote sustainable development of virtual plant modeling technology in the field of landscape architecture.