The invention provides a horizontal tube slug flow parameter measuring method based on independent component analysis and a cross correlation technique. The method introduces the independent component analysis and the cross correlation technique in an electric tomographic imaging system composed of a double-section electric sensor array with the same structure, an electronic measuring circuit andan imaging computing mechanism to realize measurement of horizontal tube slug flow parameters; that is, an independent component analysis method is employed to analyze original measurement data to find that the independent component with the largest kurtosis has good corresponding relation with change information of liquid slug in the slug flow; the cross correlation technique is further employedto perform cross correlation computation after eliminating cyclo-stationary property of the independent component with the largest kurtosis which is obtained by an upstream measurement section and a downstream measurement section to obtain an average velocity of the liquid slug in the slug flow; and duration of the liquid slug is multiplied by the average velocity of the liquid slug to obtain an average liquid slug length. The method utilizes that a measurement value obtained by the electric tomographic imaging system does not need to be combined with other measurement data to obtain the velocity and the length of the horizontal tube slug flow to save the measurement cost, expand the application scope of the electric tomographic imaging system in two phase flow measurement, and be favorable for accurately measuring the horizontal tube flow parameters.