The invention relates to the technical field of precise casting tapping, in particular to a precise casting tapping device. A guide component comprises a lifting cylinder, a lifting rod rotationally arranged on the upper portion of the lifting cylinder in the axial direction of the lifting cylinder, an integrated part which is in screw joint with the upper portion of the lifting rod through threads, a lifting seat which is in screw joint with the upper end of the lifting rod through threads, a first adjusting piece arranged at the upper end of the lifting seat, a first guide pipe which is arranged in the first adjusting piece in a penetrating mode in the radial direction of the first adjusting piece, pull rods clamped between the integrated piece and the first guide pipe, a handle which is in screw joint with the upper portion of the first adjusting piece through threads in the radial direction of the first adjusting piece, and an outer cover which is rotationally arranged on the handle and covers the upper side of the first adjusting piece.