Element detection method based on LIBS technology

The invention provides an element detection method based on an LIBS (laser-induced breakdown spectroscopy) technology, which comprises the following steps: (A1) segmenting a sample scanning track to enable each segment to be linear; (A2) corresponding to each segment Li, the distance hi between the light emitting unit and the sample is adjusted according to the step length, a data set (Iij, hij) corresponding to each excitation point in the segment is obtained, Iij is a spectral signal obtained at the excitation point, hij is the distance between the light emitting unit and the sample at the excitation point, i = 1, 2... M, j = 1, 2... N, and M and N are integers greater than 2; according to the M data sets (Iij, hij), the optimal distance hi0 corresponding to the segment Li is obtained; (A3) adjusting the distance between the light emitting unit and the sample to hi0, and scanning to obtain a spectral signal Ii corresponding to the segment Li; (A4) obtaining the optimal light intensity I according to the spe