Revolving body measuring machine has been widely used in the measurement of revolving parts with its high efficiency and precision. However, due to its own characteristics, measurement accuracy is affected by the temperature and the drift error is up to 120 μm. In order to solve this problem, a method of online thermal error compensation was presented. The method can acquire the offset and tile parameters of the gauging spindle by using the bidirectional measurement, and then use these parameters to correct the diameter of each elevation. The method is simple and easy to use, and significantly improves the measurement accuracy. The experiments show that this compensation method allows the measurement results stability error of the size to reduce to about 15 μm from 136 μm. And the measurement stability is greatly improved.