1. An automatic measurement system for plant features, comprising: a photographic device, for photographing a plant in a container, so as to generate a top view image and a side view image; and an operation processing device, electrically connected to the photographic device, and at least comprising an image processing module and a storage unit, wherein the image processing module analyzes at least one of the top view image and the side view image by using an image processing procedure and an analysis rule, so as to generate a feature data corresponding to appearance features of the plant, and records the feature data in the storage unit.