Multi-element wave peak-based laser-induced breakdown spectroscopy rock fragment type identification method

The invention provides a rock fragment type identification method. The method comprises the following steps: 1, measuring the spectra of N standard rock fragments in a range of 200-950nm by using a laser-induced breakdown spectrograph; 2, carrying out spectral line identification on the spectra of the N standard rock fragments, and finding out the wave peak spectral lines of a preset number of elements with the top contents; 3, combining the wave peak spectral lines of the selected elements in the standard rock fragments to form a characteristic spectrum as the input value of a BP nerve network, and training the BP nerve network to obtain a BP nerve network structure; 4, measuring the spectrum of a rock fragment to be identified in the range of 200-950nm by using the laser-induced breakdown spectrograph; 5, carrying out spectral line identification on the spectrum of the rock fragment to be identified to obtain spectral lines of elements same to the elements in step 2; and 6, combining the spectral line wave peaks of the selected elements in the rock fragment to be identified as the input value of the BP nerve network, and identifying the rock fragment to be identified by using the obtained BP nerve network to obtain an identification result.