Abstract: The invention belongs to the technical field of trace detection, and discloses a heavy metal trace detection method and application thereof. The detection method; comprising the following steps: preparing a quality sample; mixing the quality sample with the sample to be tested according to a specific proportion; using X-ray fluorescence spectrometer to detect trace heavy metals; and using standard curve to realize quantitative analysis of heavy metals. For the purpose of detecting heavy metal elements in tea, the application of this invention can shorten the detection time, avoid the use of a large amount of acid liquor, improve the environmental protection performance, and lower the detection cost, moreover, the obtained standard curve by this invention has high correlation and accurate detection results.