The invention relates to the drilling machine field and discloses a frequency conversion and speed regulation drilling machine which comprises a motor and a mainshaft; the drilling machine also comprises a frequency conversion and speed regulation system; the frequency conversion and speed regulation system is connected with the motor; the rotation speed of the motor is adjusted by adjusting the frequency of AC which is used for supplying the power for the motor; the drilling machine can precisely adjust the rotation speed of the motor only by rotating a knob when adopting the frequency conversion and speed regulation system; furthermore, the rotation speed is smoothly transitional, the operation is extremely simple and convenient, the time for speed regulation by workers is greatly reduced, and the working efficiency is improved further.