Novel automatic hole drilling chamfering tapping machine

The utility model relates to a novel automatic hole drilling chamfering tapping machine which mainly comprises a cutting device, a workpiece fixing device and a rotating device. The cutting device comprises a knife rest, a knife rest fixing plate and a knife. The knife rest is arranged on the knife rest fixing plate and can be adjusted and mounted freely. The knife rest comprises a hole drilling knife rest, a chamfering knife rest and a tapping knife rest. According to the tapping machine, workpiece hole drilling, workpiece chamfering and workpiece tapping can be completed in one procedure, hole drilling is carried out first, then chamfering is carried out, finally tapping is carried out, the shortcoming that procedures are completed one by one before so that manpower resources are wasted is overcome, due to the fact that the knife rest moves on the knife rest fixing plate, workpieces with different size specifications can be machined, and accordingly the novel automatic hole drilling chamfering tapping machi