Desktop annular punching device of helicopter main wing connecting part

The invention relates to the field of aeronautical part machining, in particular to a desktop annular punching device of a helicopter main wing connecting part. The device comprises a worktable, a first-stage positioning assembly, a second-stage positioning assembly and an annular drilling assembly; the first-stage positioning assembly comprises an annular gasket, a cross center positioning frameand two positioning optical axes, the second-stage positioning assembly comprises two symmetric soft clamping mechanisms and two symmetric hard clamping mechanisms, the annular drilling assembly can be vertically and movably arranged over the worktable, the axis of the drilling assembly coincides with the axis of the annular gasket, the annular drilling assembly comprises multiple vertical drill bits, the drill bits are evenly distributed in a horizontal piece in the circumferential direction, and a jacking air cylinder is arranged on the center of the bottom of the worktable. The desktop annular punching device of th