Rotation angle measuring device of indexing table

The invention discloses a rotation angle measuring device for an indexing table. The device comprises a fixed cylinder, an elastically telescopic rod is arranged in the fixed cylinder, the telescopicrod extends out of the fixed cylinder, a roller is arranged at the end part of the telescopic rod, an elliptical sleeve sleeves the indexing table, the roller is in rolling contact with the ellipticalsleeve, and a mounting sleeve is arranged in the fixed cylinder. An infrared distance measuring sensor for measuring the telescopic amount of the telescopic rod is embedded in the mounting sleeve anddetects the distance of the right end face of the telescopic rod. The telescopic stability between the fixed cylinder and the telescopic rod is ensured through a left sliding ring and a right slidingring on the outer wall of the telescopic rod, so that the measurement accuracy is ensured, the angle amount is converted into a linear value through the elliptical sleeve sleeving the indexing table,the roller in contact with t