The invention provides a method for constructing a medlar fruit phenotype group database based on a three-dimensional point cloud scanning technology, and relates to the technical field of three-dimensional point cloud scanning. The method for constructing the lycium barbarum fruit phenotype group database based on the three-dimensional point cloud scanning technology comprises the following stepsthat a, screening lycium barbarum, wherein scanning personnel conduct screening according to lycium barbarum fruits which conform to the variety characteristics and are obvious in characteristic andfree of plant diseases and insect pests; b, scanning the medlar: 1) scanning indoors by taking the complete mature medlar and the profile of the mature medlar as scanning objects; and (2) assembling an OKIO-5M scanner with the scanning precision of 0.03 mm and the scanning range of 3-400 mm, calibrating the OKIO-5M scanner by using a 2390 calibration plate, and performing calibration work according to software specified operation until calibration succeeds. Through the three-dimensional point cloud scanning technology, the surface area and the volume of the mature medlar and the internal characteristics of the medlar such as the central axis length, the width and the pulp thickness are accurately measured, medlar fruit phenotype group data can be measured in batches, manpower is saved, anderrors are reduced.