The invention relates to the field of catalysts, and discloses a silicon-zirconium modified catalyst carrier, and a preparation method and application thereof. The method comprises a contact step thatmodified silicone oil and nano-zirconium dioxide dispersion liquid make contact with an alumina carrier, specifically, the modified silicone oil is one or more of alkyl modified silicone oil, polyether modified silicone oil, epoxy modified silicone oil, amino modified silicone oil, polyester modified silicone oil, and hydroxyl modified silicone oil. By means of the method, the surface acidity andacid strength properties of the carrier are improved so that the carrier can be used to prepare a highly active hydrotreating catalyst.