Boring machine for machining damaged machine tool bed hole of large-size machine tool

The utility model discloses a boring machine for machining a damaged machine tool bed hole of a large-size machine tool. The boring machine for machining the damaged machine tool bed hole 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 cycloidal gear speed reducer. The boring machine for machining the damaged machine tool bed hole of the large-size machine tool has the advantages that the well assembled boring machine is directly installed on a machined datum plane of the machine tool, a boring machine bed base plate is fixed to the datum plane through bolts, datum sleeves used for positioning and provided with copper sleeves are installed in undamaged machine tool bed holes 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, the belt pulleys and the cutter bar sha