The invention discloses a method for forming a hole in a curved surface or an irregular surface. The method is that an included angle between an axis and the level is determined according to the axis direction of a preset mounting connecting tube; a supporting frame and a horizontal frame are used in match; the axis of an axis rod is overlapped with the axis of the preset mounting connecting tube; three supporting pins are used for stabilizing the supporting plane, so as to prevent the axis rod from moving, and as a result, an accurate hole forming cutting track line can be drawn. According to the method, the shortages in the prior art can be overcome; the axis of the preset mounting connecting tube can be accurately and quickly found out, so that the axis rod and the preset mounting connecting tube are under the same axis; meanwhile, the axis rod cannot slide on the device and is conveniently dismounted; in addition, the hole forming is free of limitation from material, so that the method is widely applied to the device under various materials.