Tool bit for full-automatic rotary scraper

The utility model discloses a tool bit for a full-automatic rotary scraper, and relates to an auxiliary tool for buried plastic pipeline construction. The cutting edge and the pressing blocks are formed on the cutter body, the two pressing blocks correspond to the two sides of the cutting edge, each pressing block is provided with a contact face used for making contact with the surface of a pipe or the surface of a pipe fitting, each contact face inclines relative to the plane where the cutting edge is located, the included angle between one contact face and the plane where the cutting edge is located ranges from 6 degrees to 8 degrees, and the included angle between the other contact face and the plane where the cutting edge is located ranges from 6 degrees to 8 degrees. The included angle between the other contact face and the plane where the cutting edge is located is increased by 2 degrees on the basis of the included angle of one contact face, and the sharp edge, close to the plane where the cutting edge