An automatic measurement system for plant features includes: at least one 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 devices, and at least including an image processing module and a storage unit. The image processing module analyzes at least one of the top view image and the side view image by using at least one image processing procedure and at least one analysis rule, so as to generate at least one feature data corresponding to appearance features of the plant, and records the at least one feature data in the storage unit.