In response to the measurement requirements of turbulence in the study of cloud precipitation physics， a turbulence parameter characterization method based on digital holographic interferometry to measure the microphysical fluctuation of liquid cloud is proposed. Since there is no need to assume the distribution function of the cloud droplet spectrum and adjust related parameters， digital holographic interferometry can obtain the microphysical fluctuations of the liquid phase cloud affected by the actual turbulence. The fog droplets affected by steady turbulence are used to simulate liquid phase cloud droplets， and the droplet spectrum is recorded by a camera with a pixel size of 1.67 μm， and then the fluctuations of the water content and the average radius of the droplets are obtained. According to the theory of turbulence， the variance， time correlation coefficient， covariance and cross-correlation coefficient of turbulence are obtained. Finally， by analyzing the time correlation coefficients of water content at different intervals， the time scale of the turbulent field is 100 ms. Under the condition of a fixed sampling interval of 71 ms， the time correlation coefficient of water content at different initial times is analyzed， and the maximum deviation of the fluctuation from the average value is 23%， which proves that the flow field in the measurement area is steady turbulence. This method can provide an effective measurement method for studying the characteristics of liquid cloud microphysics and turbulence and the mechanism of their mutual influence.