Flexible positioning pin

The invention relates to a flexible positioning pin which comprises two one-dimensional motion working platforms, a rotary working platform and a positioning pin device, wherein each one-dimensional motion working platform comprises a vertical motion working platform and a horizontal motion working platform; the positioning pin device comprises a base (4) and a positioning pin (3); the positioning pin (3) is connected with the base (4) by interference fit; and the rotary working platform comprises a support disk (2), a rotary disk (6), an adjusting screw (7) and a locking screw (5). The invention can be used for a flexible clamp for processing aircraft skin tools and positioning a workpiece.