The invention discloses an optical voltage sensor hanging device for GIS bus voltage measurement. The optical voltage sensor hanging device for GIS bus voltage measurementcomprises a hanging device shell, a matching sensor bracket, a pressure plate, a fiber optic flange, a connecting plate, wherein the sensor bracket and the pressure plate arearranged in the hanging device shell and used for erecting an optical voltage sensor, the fiber optic flange is arranged on a device shell and used in cooperation with the optical voltage sensor,the connecting plate is used for fixing the hanging device shell to a GIS shell flange; a basin insulator and an opening face attached with the GIS shell flange are designed in the hanging device shell; the optical voltage sensor is fixed to the bracket in a crimping mode by adjusting fastening screws at both ends of the pressure plate. According to the optical voltage sensor hanging device for GIS bus voltage measurement, the optical voltage sensor is fixed on the outer surface of the insulating part of the GIS basin insulator through the arrangements of the hanging device shell and the connecting plate, the electric field distribution at the place ismeasured by using the optical voltage sensor, the GIS bus voltage measurement can be realized, and the sensor can be mounted, disassembled, operated, and maintained without affecting the operation ofthe device once.