The invention relates to a method for preparing solvent-free high hydrogen containing silicone oil, belonging to the field of chemical engineering and comprising the following steps of: adding methyl dichloresilane and methyl chlorosilane as raw materials in proportion in an agitated reactor, mixing uniformly; on the premise of stirring, adding excessive inorganic salt or hydrochloric acid or a mixed solution of inorganic salt or hydrochloric acid in the agitated reactor at a certain speed, controlling the temperature in the agitated reactor, keeping the temperature to be -5 DEG C-4 DEG C until the reaction is ended, standing and demixing, drying upper components with anhydrous sodium carbonate or sodium bicarbonate or calcium oxide and neutralizing remained acid; and aggregating the dried and neutralized upper components, and removing low-boiling-point substances to obtain the solvent-free high hydrogen containing silicone oil. The invention avoids using the solvent toluene when the high hydrogen containing silicone oil is synthesized by using chlorosilane monomers in the traditional process, saves the energy sources, lowers the pollution to the environment, and can obtain an excellent-quality product with transparent appearance, high hydrogen content and no solvent odor.