Automatic drilling machine and drilling operation method

The invention provides an automatic drilling machine and a drilling operation method. The scheme is used for performing drilling operation on a rock layer. The automatic drilling machine comprises a first movable chassis, a second movable chassis, a main drilling part, a drill pipe warehouse and a mechanical arm, wherein a fixed support frame is arranged on the first movable chassis; the second movable chassis is connected with the first movable chassis and moves along with the first movable chassis; the main drilling part is arranged on the fixed support frame, and can be used for filling drill pipes and drilling the drill pipes into preset positions of the rock layer, or withdrawing the drill pipe completing the drilling operation from the rock layer; the drill pipe warehouse is flexibly connected onto the second movable chassis and can store a plurality of drill pipes; the mechanical arm is arranged on the first movable chassis or the second movable chassis and can move the drill pipes stored in the drill