Hollow encoder precision compensation jig

The utility model discloses a precision compensation jig for a hollow encoder. The jig comprises an end cover, a vertical mounting rod is mounted in the end cover, the mounting rod is sequentially divided into a bottom rod, a middle rod and an upper rod from bottom to top, the size of the bottom rod is larger than that of the middle rod, and the size of the middle rod is larger than that of the upper rod; wherein the bottom rod extends into the end cover and is connected with a motor, a high-precision optical encoder is installed on the motor, and the periphery of the middle rod and the periphery of the upper rod are both used for installing magnetic ring disc jigs. The hollow encoder precision compensation jig is used for carrying out precision compensation on a hollow encoder, on one hand, the hollow encoder precision compensation jig and the hollow encoder can keep high concentricity and rotate synchronously, the compensation effect is guaranteed, and the precision of the hollow encoder is improved; the ma