Preparation method for silicon resin used for high temperature-resistant coating

The invention relates to the field of organic silicon resin synthesis, and in particular relates to a preparation method for silicon resin used for a high temperature-resistant coating. The preparation method is characterized by comprising the following steps of: firstly, hydrolyzing C6H5SiX3, C6H5CH3SiY2 and toluene by H2O, rinsing the hydrolysate to be neutral, then taking oil phase, and adding C6H5SiCl3, C6H5CH3SiCl2 and toluene and carrying out inverse hydrolyzation by H2O; and removing HCL gas generated in inverse hydrolyzation, adding water for continuous reaction when pH of the system is more than or equal to 2, rinsing reaction solution to be neutral, decompressing and removing residual water and micromolecules, retaining the oil phase, telomerizing the viscosity of the product by KOH alcohol solution, adding water and toluene to stop catalysis telomerization reaction when coating minus four cup for 25-75 seconds, rinsing to be neutral, decompressing and removing residual water and micromolecules by s