Abstract: The rapid development of green fodder harvesters has put forward higher requirements for the perfection of functions, the intelligence of control, and the convenience of operation. In order to facilitate the sharpening of the blade of the disc knife type shredder, this electronically controlled automatic sharpening device is designed. Using the concept of mechatronics, a DC worm geared motor is used to drive the screw to rotate and drive the annular grindstone forward. In thispaper, the precise control of the movement of the ring whetstone is realized by controlling the counting of the encoder pulse s and the s ize of the current input, and the motion process is controlled digitally. In addition to the feedback of rotation,m ovementand value, display function andremote communication function, the sharpener system provides a mor e accurateand reliable data basis for the operator’s precise adjustment and control, and more importantly, it reduces thedifficult y of complex operation through the system’s own intelligent detection function and automatic control function, so that the automatic sharpening function is more perfect, the safety is also improved, and the operating efficiency of the machineryand the service life of the moving blade are improved. Through orthogonal experiments, it is determined that when the shredder speed is 450r/min and the input current is 450mA, the sharpening effect is the best.