The invention discloses a variable amplitude drilling machine capable of adapting to various working conditions. The variable amplitude drilling machine is provided with a movable chassis; a rotatable upper turntable is arranged in the middle of the upper portion of the chassis; a control device is arranged on the upper turntable; and a drilling arm is mounted on the upper turntable in a hinged mode. A hinged support a is arranged in the position, below the drilling arm, on the upper turntable; a hinged support b and a hinged support c are further arranged on the middle portion of the drilling arm; a supporting arm cylinder is arranged between the hinged support a and the hinged support b; a connecting lever is hinged to the front end of the drilling arm; a turnover arm is mounted on the front portion of the connecting lever in a hinged mode; a hinged support d is arranged on the rear portion of the connecting lever; and a pitching cylinder is arranged between the hinged support d and the hinged support c. A hinged support e is arranged on one side of the connecting lever; an angle swinging cylinder is mounted on the hinged support e in a hinged mode; the front end of a telescopic rod of the angle swinging cylinder is hinged to one side of the turnover arm; a bracket is mounted on the front portion of the turnover arm in a hinged mode; a hinged support f is arranged on the front portion of the bracket; a turnover cylinder is mounted at the bottom of the turnover arm in a hinged mode; and the front end of a telescopic rod of the turnover cylinder is hinged to the hinged support f. The structure is simple, operation is convenient, the drilling amplitude is adjustable, and the variable amplitude drilling machine can adapt to the various working conditions and has good application and popularization value.