Solar thermal power generation system of high temperature heat transfer medium silicone oil: in order to improve the efficiency of power generation, solar thermal power generation system of heat transfer medium working temperature of up to 400℃ above, general thermal oil not only can not meet the requirements of safe working temperature, and thermal oil in long-term pumping operation due to mechanical shear molecular chain will lead to reduced heat resistance. Silicone oil with semi-inorganic semi-organic polymer structure, excellent heat resistance and shear resistance of polymer molecules, can be used as a heat transfer medium for photothermal power generation, the specific structure of phenyl silicone oil not only has excellent heat resistance and shear resistance, but also has outstanding heat oxidation properties. At the same time, additives such as heat stabilizer are introduced to further improve the thermal stability of silicone oil. The application of benzyl silicone oil as an efficient heat transfer medium can ensure the long-term stable operation of the photothermal power generation system.