The utility model provides a pair of wedge -form caisson structure of diapire and wharf structure thereof, its front end breach that can insert the harbour, wherein, the caisson includes the caisson storehouse check that a plurality of links to each other side by side, and caisson storehouse check include inner wall, antetheca and diapire, its diapire wedgewise, and inner wall and harbour breach side are tangent, and the diapire is tangent with the foundation bed at harbour to reinforcing wharf structure 's anti -skidding stability against overturning. The diapire of caisson storehouse check is the wedge, and its and domatic inclination are unanimous, insert the foundation bed breach to one side among, utilize between caisson structure and foundation bed interact to resist the horizontal force of pier, the backfill's in the caisson main part whole focus moves backward, increase the stability of antidumping.