The invention discloses a garden green plant maintenance method and relates to the technical field of plant maintenance. According to the technical scheme, the method is characterized by including thesteps of a, pruning, to be more specific, pruning the water sprouts, crossing branches, droopy branches, germinated branches, diseased branches and withered branches of trees under the condition thatthe natural tree shape and crown shape are kept, wherein a lifting device is used during the pruning, the lifting device comprises a base, multiple wheels and a handrail, a square frame is fixedly connected to the base, an annular groove is formed in the square frame, an annular frame is slidably connected into the annular groove, a support plate is fixedly connected to the top of the annular frame, a first drive mechanism is mounted on the base, a first ladder is fixedly connected to one side of the square frame, and a second latter is fixedly connected to one side of the support plate; b, using a garden shaping plant maintenance agent to spray the pruned trees once to twice every week. By the lifting device, maintenance staff can conveniently prune the plants.