Boring machine for machining damaged hole in body of large-size machine tool

The invention discloses a boring machine for machining a damaged hole in the body of a large-size machine tool. The boring machine for machining the damaged hole in the body of the large-size machine tool comprises a cutter bar shaft, four gears, two gear sets, three belt pulleys, a pushing shaft, two transmission shafts and a cycloid reducer. The boring machine for machining the damaged hole in the body of the large-size machine tool has the advantages that the well assembled boring machine is directly installed on a reference plane which is machined by a machine tool, a base plate of the body of the boring machine is fixed to the reference plane with bolts, reference sleeves which are used for positioning and well provided with copper sleeves are installed in fine holes in the body of the forging machine tool respectively, then the cutter bar shaft, the belt pulleys and a triangular belt are assembled, power is input through a main motor belt pulley to drive a cutter bar belt pulley and drive the cutter bar