The utility model belongs to the mining technical field, concretely relates to a kind of drilling device for open-pit mining exploitation blasting, including disc, the top of disc is equipped with three support columns, the top of disc is equipped with lifting mechanism, the top of lifting mechanism is equipped with support plate, the top of support plate is equipped with sliding slot one and sliding slot two, sliding slot one and sliding slot two are perpendicular to each other, sliding member is slidably connected in sliding slot one or sliding slot two, the top of sliding member is equipped with driving motor two, the output end of driving motor two is equipped with drilling mechanism, recess one is formed in the adjacent two side surfaces of sliding member, driving mechanism is installed at the corresponding position of sliding slot one and sliding slot two with recess two respectively, relative to prior art, the utility model can be quickly switched between different sliding groove directions, greatly improve the efficiency and convenience of drilling position adjustment, can accurately move drilling mechanism to any drilling position required by mining exploitation blasting.