The invention discloses a convenient non-damage peach fruit hardness measuring model establishing method. The convenient non-damage peach fruit hardness measuring model establishing method comprises the following steps: 1) selecting a sample; 2) screening of diameters of detecting probes: carrying out non-damage measurement on fruit hardness by selecting a columnar probe with the diameter of 0.10cm<2>; 3) damaged measurement of hardness of fruit; 4) non-damage measurement of the hardness of the fruit; 5) establishment of a function conversion model: calculating to obtain a function model capable of representing damaged and non-damage conversion of all types of peach fruits, wherein shore hardness SD= 0.154Fff-7.084; and 6) representing a peach fruit hardness result. By the method, changeof fruit hardness of different types of peach fruit in processes of harvesting, transportation, storage and selling under a non-damaged state can be detected rapidly, effectively and accurately, and the application range is wide. Through the hardness detecting model established by the function, non-damaged detection on hardness of all types of peach fruits can be realized, and the hardness state of the fruits can be described by scientific terms.