Scraper for difficult-to-machine face

The utility model provides a scraper for a difficult-to-machine face, comprising a disk-shaped cutter body, a cutter bar, and a driving main shaft for driving the cutter bar to rotate, wherein the difficult-to-machine face is a processed face which is shielded by a lug boss, the central axis of the driving main shaft is taken as x-axis, a straight line which is vertical to the central axis of the driving main shaft and is located on the difficult-to-machine face is taken as y-axis, the radius of the cutter body is greater than that of the driving main shaft, and the difference L1 between the cutter body radius and the driving main shaft radius is greater than the distance L2 between the highest point of the lug boss on the y-axis and the lowest point of the difficult-to-machine face. Cutter radius of the scraper for the difficult-to-machine face is increased so that enough margin is left between other parts of a work piece and the cutter body to prevent the condition that the other parts of the work piece col