Positioning mechanism for valve body machining

The utility model provides a positioning mechanism for valve body processing, which comprises a sliding mechanism and a fixing mechanism which are correspondingly arranged at the upper end of a base, the sliding mechanism and the fixing mechanism are devices with the same structure and the same size, a sliding rail is arranged on the base, a sliding block used for being connected with the sliding mechanism is arranged on the sliding rail in a sliding mode, and the sliding block is connected with the sliding mechanism. The sliding mechanism comprises a positioning seat fixedly connected with the sliding block, a rubber ring penetrating through a through hole of the positioning seat, and an ejector rod sequentially penetrating through the positioning seat and the rubber ring along the upper end of the positioning seat. The sliding mechanism and the fixing mechanism are used in cooperation, the valve body is prevented from falling off from the interior of the positioning tool, the ejector rod is arranged to be m