Cutter adjusting mechanism and device

The invention relates to the field of milling cutters, and provides a cutter adjusting mechanism which comprises a cutter head, an adjusting block is mounted at the bottom of the cutter head, and a cutting edge is arranged at the bottom of the adjusting block; an adjusting groove is formed in the bottom of the tool bit, and the adjusting block is installed in the adjusting groove in a sliding mode. An adjusting rod is installed above the tool bit, the bottom of the adjusting rod is connected with a gear, and a rack is arranged in the middle of the adjusting block. The adjusting rod is rotated to enable the gear to rotate, when the gear rotates, the gear is meshed with the rack, due to the fact that the position of the adjusting rod is not changed, the positions of the rack and the adjusting block are changed, the positions of the cutting edges at the bottom of the adjusting block are moved, and the two sets of symmetrically-arranged cutting edges are far away from or close to each other; and finally, the size