A method for dispersing a high-viscosity organosilicon compound in water solves the problem that the high-viscosity organosilicon compound is hard to emulsify and disperse in water. The method is characterized in that the components of polysiloxane with lower molecular weight and an emulsifier are added into the high-viscosity organosilicon compound, wherein the viscosity of the polysiloxane withlower molecular weight is between 5 and 3,000mPa.s, and the emulsifier is a nonionic surfactant. If the high-viscosity organosilicon compound is counted as 100 portions, the dosage of the polysiloxane with lower molecular weight is 5 to 50 portions, and the dosage of the emulsifier is 40 to150 portions. The method prepares the emulsion through an'agent-in-the-oil' method which comprises the following steps of A, violently stirring the high-viscosity organosilicon compound and the polysiloxane with lower molecular weight for intensive mixing for 20 to 40minutes; B, adding the emulsifier and stirring the emulsifer for 15 to 45minutes; C, heating up the system to between 55 and 85 DEG C, then keeping the system temperature unchanged, adding water slowly, improving the stirring speed to change the W/O type emulsion into the O/W type emulsion, and preliminarily reaching the mass concentration of 20 to 60 percent; D, carrying out further emulsification when the emulsion passes through a colloid mill; and E, finally diluting to the required concentration with water.