Under different laser irradiation energies and positions, the pressure value and onset time of laser plasma shock waves are collected and extracted with test microphones, the propagation law of plasma shock waves in air is analyzed, and the relation function between sound pressure value of shock waves and laser irradiation energy is fitted. The results indicate that laser plasma shock waves propagate in the forms of spherical waves and the relationship between their sound pressure values and laser irradiation energy is nonlinear and positive.