Dustproof rotation support for outdoor AC high-voltage isolator switch

The utility model provides a dustproof rotation support for an outdoor AC high-voltage isolator switch. An upper bearing chamber and a lower bearing chamber are internally provided with a large-diameter upper conical roller bearing and a small-diameter upper conical roller bearing respectively which are arranged face to face; and the two conical roller bearings are externally provided with rotation dustproof portions for sealing the bearing chambers respectively. According to the technical scheme, the dustproof rotation support has enough axial support and radial support capability, and the structure is good in seal performance; the dustproof rotation support has the technical advantages of being dustproof and lasting in seal effect; and the technical purpose of maintenance-free is realized.