Drilling device and method for rock breaking

The invention belongs to the technical field of natural gas well drilling construction equipment, and particularly relates to a rock breaking well drilling device and method.The rock breaking well drilling device comprises a liquid supply mechanism and an external driving mechanism, and a driving part of the liquid supply mechanism is connected with a rock breaking mechanism through a drill rod; the cavity of the lower joint is connected with the output end of the liquid supply mechanism; the axial flow booster pump is clamped in the lower connector, an impeller rotating shaft of the axial flow booster pump is connected with an internal drill bit, the internal drill bit is inserted in the external drill bit, and the axial flow booster pump is used for pressurizing drilling fluid and driving the internal drill bit to rotate in the direction opposite to the external drill bit at the same time; and drilling fluid flowing out of the axial flow booster pump forms high-pressure jet flow to be sprayed out from liqui