The invention discloses a bearing machining base accurate in positioning. The bearing machining base comprises a lower base and an upper base, the lower base comprises a base body, the base body is provided with a lower fixing part, and at least two lower fixing grooves are formed in the upper end face of the lower fixing part; the upper base comprises an upper fixing part, upper fixing grooves are formed in the upper fixing part and correspond to the lower fixing grooves, and a complete through cylinder groove can be formed by the upper fixing grooves and the lower fixing grooves; and installing bases are arranged on the two sides of the upper fixing part and the lower fixing part, and base holes are evenly formed in the base body around the edge. The bearing machining base is used, a workblank can be fixed stably, the circle of the outer ring of the workblank is evenly stressed, and the workblank is fixed into the cylinder groove formed by the upper fixing grooves and the lower fixing grooves; and compared with the mode that a traditional machining base uses a plurality of fixing blocks for positioning, in the mode, the workblank is not prone to displacement or moving in the machining process. The machining consistency of an inner hole of the workblank can be greatly improved, and the machining efficiency can be greatly improved.