The invention discloses a drilling method. The drilling method is characterized by comprising the following steps: a, drawing a drill pipe and a transmission bar axially close, wherein elastic pieces are bent; b, penetrating a narrow space with opposite two sides by a supporting arm, wherein the axis of the drill pipe is perpendicular to a to-be-drilled surface, and the front end of the drill pipe reaches a to-be-drilled position; c, starting a power source to drive the transmission bar, the elastic pieces and the drill pipe to rotate synchronously, and applying a force by virtue of the supporting arm and the elastic pieces, wherein the drill pipe is fed to drill; d, after the drill pipe drills more than two-thirds, lifting up the supporting arm to drive two arc-shaped plates to draw close, wherein the elastic pieces extend, continuously applying a force by the supporting arm, wherein the drill pipe fully penetrates into the drill hole, the lower ends of the elastic pieces are straightened and penetrate into the drill hole, and the drill is continuously fed; and e, drilling a given depth, lifting up the supporting arm, driving the two arc-shaped plates to be separated, wherein the elastic pieces are bent to drive the drill pipe to be out of the drill hole, and removing the supporting arm to realize drilling. The drilling method disclosed by the invention can be used for drilling.