Provided is a laser-induced breakdown spectroscopy technology based quantitative analysis method for lead elements in tea, which falls within the field of spectral analysis. The method comprises: preliminarily analyzing tea having different lead concentrations by means of an LIBS device, and determining a spectral line with lead elements at the position of 405.78 nm according to the American standard atomic spectral line library; then, placing LIBS spectral signal data into a stochastic resonance bi-stable system, and establishing a stochastic resonance system equation; subsequently, optimizing parameters by means of an ant colony algorithm, performing numerical simulation on an optimized stochastic resonance system equation by means of a four-order Runge-Kutta algorithm, and fitting spectra by means of a Voigt function to acquire a signal spectral line after stochastic resonance amplification; and finally, constructing a calibration curve between the lead concentrations of the tea and the signal spectral line to realize the quantitative analysis of lead elements in a practical tea sample. The present invention has the advantages of high discrimination accuracy, simplicity, rapidness, etc., and a reference method is provided for heavy metal content analysis of tea.
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