Method for preparing methyl phenyl silicone oil by one-kettle method

The invention provides a method for preparing methyl phenyl silicone oil by a one-kettle method, which comprises the following steps: S100, at the temperature of 40-90 DEG C and in the presence of water and a first catalyst, reacting phenyl dialkoxy silane selected from methyl phenyl dimethoxy silane and diphenyl dimethoxy silane with phenyl dialkoxy silane selected from dimethyl cyclosiloxane and alpha, beta-dimethylcyclosiloxane; the method comprises the following steps: carrying out hydrolysis reaction on a chain extender of alpha, omega-dihydroxy polydimethylsiloxane, and carrying out first low component removal treatment; s200, adding a second catalyst, and reacting at 70-160 DEG C; s300, carrying out second low-boiling-point removal treatment to obtain methyl phenyl silicone oil; wherein the first catalyst and the second catalyst are respectively and independently selected from tetramethylammonium hydroxide silicon alkoxide and potassium hydroxide silicon alkoxide; the method further comprises the step