By preparing seven kinds of rock cutting samples with different moisture content, experiments were conducted to study the effect of moisture content on laser-induced rock cuttings plasma properties and the method for correcting the concentration of each element in different moisture content. The variation of the intensity of the Ca 422.67 nm line with the moisture content of the rock cutting samples was studied. The average plasma temperature under different moisture contents was calculated by the Boltzmann-plot of the four lines of Ca II and Al I. The electron density of the plasma with different moisture contents was obtained by using Lorentz fitting of the Ca 422.67 nm line.The results show that with the increase of moisture content, the spectral intensity, plasma temperature, electron density all decrease linearly and there are also great differences in the quantitative analysis results of the calibration free models for each element, but the laser-induced cuttings plasma with different moisture content all meet the Mc Whirter criterion of local thermodynamic equilibrium and the calibration free model can be used for the analysis and simple correction of moisture content effects.