The invention relates to a grinding method for non-circular curved glass ornaments based on point cloud data description. According to the grinding method, by determining the linkage data for controlling the workpiece rotary motion and longitudinal tracking feed, the exterior contour of any non-circular curved glass workpiece is machined. Only according to the data of glass workpiece contour points and the structural parameters of a numerical control machine, the linkage data for controlling the workpiece rotary motion and longitudinal tracking feed can be obtained. The contour with or withoutdefinite mathematical model can be applied, the grinding precision is high, and the error is little. The disadvantages such as tedious drawing and heavy workload of the machining track of a special-shaped non-circular contour by a geometric drawing method in engineering are overcome better, and the shortcomings of fitting error and complex formula calculation existing in a curve fitting method are overcome.