The invention discloses a cutting grinding device for workpiece machining. A workbench, a motor I, a motor II and a blade are included. The cutting grinding device is characterized in that side platesare vertically fixedly connected to the two ends of the top of the workbench, a transverse plate is horizontally fixedly connected to the tops of the side plates, and the top of the workbench is transversely provided with a plurality of clamping devices; the bottoms of the clamping devices are fixedly connected with sliding blocks I, the top, corresponding to the sliding blocks I, of the workbench is provided with sliding grooves I, and the sliding blocks I are arranged in the sliding grooves I in a sliding manner; fixing blocks are fixedly connected to the bottoms of one side walls of the clamping devices, the fixing blocks are provided with vertical through holes, bolts are coaxially screwed in the through holes, and the sliding grooves I are provided with threaded holes corresponding to the through holes. By means of the cutting grinding device, manual direct workpiece cutting is avoided, safety guarantee is improved, workbench damage is avoided, and the cutting efficiency is high;and workpieces with unsmooth cutting edges and burrs are conveniently ground in time, time and manpower are saved, the work efficiency is improved, and the defective rate is reduced.