The invention discloses a method for non-damage measuring the tea polyphenol content in tea, based on near-infrared spectrum technique, which comprises that first building a correct model, collecting tea sample as correct sample group, scanning the correct sample group to obtain visible light spectrum and near-infrared light spectrum (325-2500nm), processing spectrum pretreatment on the spectrum data, then using international standard method to measure the tea polyphenol content of correct sample, using multi-element correct regression algorism to build the quantitative relationship between the near-infrared spectrum and the tea polyphenol content of the correct sample, to build the correct model. The invention only needs to scan the near-infrared spectrum of object tea, and input pretreated spectrum data into the correct model which can test the tea polyphenol content. The whole process is controlled by a computer, to realize data pickup, store, display and process functions.