Underwater rapid drilling and blasting construction device and method for deepwater inclined rock stratum

The underwater rapid drilling and blasting construction device comprises a drilling and blasting ship for machining, a widening platform is arranged on one side of the drilling and blasting ship, two rows of drilling hole positions are arranged on the widening platform, one row of holes in the outer side are reserved hole positions directly excavated in a deck, and the second row of holes in the inner side penetrate through a ship body; a welding steel pipe is arranged on the hole site to serve as an operation channel of a drill rod or a casing pipe, a crawler-type holding-up hammer drilling machine and an air compressor matched with the crawler-type holding-up hammer drilling machine are arranged on the drilling and blasting ship, positioning anchor gears are arranged at the four corners of the drilling and blasting ship, and the drilling and blasting ship is provided with positioning heavy anchors. The invention further provides an underwater rapid drilling and blasting construction method for the deepwater