Offshore area rock foundation pit and construction method

The invention relates to the technical field of offshore area ocean engineering construction, and particularly provides an offshore area rock foundation pit and a construction method. The offshore area rock foundation pit is arranged on the offshore area seabed, the offshore area seabed comprises a lower rock layer and an upper sediment layer, and the offshore area rock foundation pit comprises a pit body penetrating through the sediment layer and at least partially located in the rock layer; the mud blocking structure surrounds the pit body and penetrates through the sediment layer, the section of the mud blocking structure in the thickness direction perpendicular to the pit body is in a spindle shape, and the axis of the mud blocking structure extends in the first direction; the first direction is parallel to the ocean current direction; the first fixing piles surround the pit body and are located between the pit body and the mud blocking structure, and at least part of the first fixing piles penetrate into