The invention relates to a grinding method of front corners of a milling cutter. The grinding method comprises the steps that a milling cutter clamp is arranged on a workbench of a machine tool and positioned through two positioning bolts, and after the position of the milling cutter is adjusted, the milling cutter and the milling cutter clamp are fixed through screws; a milling cutter handle swings, and the milling cutter and the milling cutter clamp rotate around the axes of the two positioning bolts in a fixed-axis manner at the same time; a front corner grinding wheel is arranged above the clamp and the milling cutter; a grinding wheel protection cover is arranged; a positioning plate is fixed to the milling cutter clamp through a bolt; halving pieces and the halving number of the halving pieces are set according to the cutter tooth number of the milling cutter; the halving pieces and the milling cutter are adjusted and fixed through fastening screws; the screws and the fastening screws are fastened; the grinding wheel is used for grinding the front corner of one cutter tooth; the bolt is loosened, and a positioning pin of the positioning plate is pulled out; the cutter and the positioning plate are rotated, and the positioning pin is inserted into the other adjacent halving piece hole; and the bolt is screwed, the front corners of two cutter teeth are ground, and the front corners of all the cutter teeth are circularly ground. The grinding machining can be finished with existing simple equipment, and precision is not affected.