Inorganic filler surface treating agent as well as preparation method and application thereof

The invention discloses an inorganic filler surface treating agent as well as a preparation method and application thereof, and belongs to the field of organic silicon materials. The preparation method of the inorganic filler surface treating agent comprises the following steps: A, stirring double-end vinyl polysiloxane, a platinum catalyst and a hydrogen-containing silane coupling agent at 45-90 DEG C for 0.5-4 hours to generate a first-step hydrosilylation reaction; and B, adding hydrogen-containing silane into the system after the reaction in the step A, stirring at 80-120 DEG C for 1-3 hours to carry out a second-step hydrosilylation reaction, and filtering to remove low-boiling-point substances, thereby obtaining the product. When the surface treating agent is used for carrying out surface chemical modification treatment on a heat-conducting inorganic filler in an organic silicon heat-conducting material, the hydrophobicity of the inorganic filler can be remarkably improved, the interfacial compatibility