The invention relates to the technical field of electromechanical equipment, and discloses an intelligent device for tree planting, nursing and pruning. The intelligent device comprises a shell, a button is fixedly connected to the exterior of the shell, an extending opening is formed in the surface of the shell, a rotating wheel is movably connected to the interior of the shell, a first connecting rod is movably connected to the interior of the shell, a movable wheel is rotationally connected outside the first connecting rod. Under the interaction of the rotating wheel, the first connecting rod, the movable wheel, a first spring, a second connecting rod, a sliding rail, a sliding block, a support, a supporting plate, a motor, a rotating disc, a disinfection plate, a mounting shell, an electromagnet, a movable plate, an iron plate, a telescopic rod, a blade, a detection assembly and a photosensitive assembly, the situation that normal growth of trees is affected due to the fact that pruned parts are infected with bacteria and lesion occurs can be avoided, meanwhile, the growth speed of the trees is effectively increased, the growth quality of the trees is further improved, the environmental benefits and economic values of the trees are increased, and the income of planting personnel is increased.