Laser spectrum analysis method and device for elements in liquid

The invention relates to the technical field of carrying out quantitative analysis on elements in liquid through the laser-induced-breakdown spectroscopy technology, in particular to a laser spectrum analysis method and device for the elements in the liquid. The method includes the steps that a target solution in a sample cell is transmitted through a metal capillary tube; the target solution is pumped to a laser action area through a silica gel hose from the sample cell by means of a peristaltic pump; laser beams emitted by a laser device directly act on the solution in the tube after being focused on the tube wall of the metal capillary tube through a laser focusing lens to burn through and penetrate through the tube wall; a plasma spectrum formed by the target liquid is emitted by forming a plasma plume; the plasma spectrum is transmitted to a spectrograph for characteristic spectrum analysis through an optical fiber after being collected through a spectrum collection lens set. The elements in the liquid and stability and accuracy of the content of the elements are analyzed through the laser-induced-breakdown spectroscopy technology, the analysis efficiency is effectively improved, and the elements in the liquid are rapidly analyzed in a qualitative and quantitative mode.