Processing on-line measuring method of water turbine blades

The invention relates to the technical field of water turbine blades processing, and provides a processing on-line measuring method of water turbine blades. The method comprises the steps of modeling,workpiece clamping, setting a coordinate origin, tool testing detection, correction, rough processing, finish processing and the like, wherein the tool testing detection comprises the steps: processing a preset area of a blank, and then selecting more than five point lines on each processing surface for detection; and the correcting comprises the steps of inputting detected data into a control unit through a control panel, comparing the detected data with a 3D digital model to determine processing deviation, and then correcting the processing amount of the next step according to the comparison result. Therefore, the 3D digital model of the blades is established, and the tool testing detection step and the correction step are arranged before the rough processing and the finish machining; and the data of the water