The Monte Carlo model of laser scattering in turbid media was established with the help of scattering angle from the cumulative probability density interpolating of the Mie scattering phase function. With the model， the laser multiple scattering in uniform monodisperse polystyrene turbid medium was studied， the influence of turbid media with different optical depths and scattering phase function on laser multiple scattering was explored. By controlling the concentration of 5 μm and 10 μm size polystyrene particles， changing the optical depths of the turbid medium as 2， 5 and 8， the theoretical simulation and experimental side scattering images were obtained and compared. The percentage difference of scattering light intensity attenuation between the simulation and experiment is measured less than 16% under the same medium condition， and the trend of them is basically the same. The simulation can also provide the distribution of light intensity of different scattering orders， and accurately analyze the influence of multiple scattering.