The invention belongs to the field of workpiece wall thick detection, and discloses a method of detecting wall thickness of a revolving body. The method of detecting wall thickness of a revolving bodyincludes the steps: S1, measuring a plurality of measuring points on a plurality of sections of the revolving body to be detected, and obtaining a point cloud set of the revolving body to be detected; S2, constructing a three-dimensional ideal model of the revolving body to be detected, obtaining a point cloud set of the three-dimensional ideal model, and integrating the point cloud sets of the revolving body to be detected and the three-dimensional ideal model into the same coordinate system; and S3: constructing a three-dimensional tetrahedral mesh model through the point cloud set of the revolving body to be detected, and performing aligning comparison on the obtained three-dimensional tetrahedral mesh model and the three-dimensional ideal model, thus obtaining the wall thickness difference between each location of the revolving body to be detected and the three-dimensional ideal model so as to complete detection of the wall thickness of the revolving body to be detected. The method of detecting wall thickness of a revolving body can realize automatic measurement of the wall thickness of the workpiece, has high measurement precision, and is especially suitable for wall thickness measurement of high-precision aerospace parts.