Rotary drilling bit of engineering driller

Provided is a rotary drilling bit of an engineering driller. The utility model relates to the technical field of drilling equipment, in particular to a drilling slag tapping device which is mainly used for solving the problem of low drilling slag tapping efficiency and comprises a barrel, an upper cover is arranged at the top of the barrel, a torque transmission sleeve is fixedly arranged in the center of the upper cover, a torque transmission internal spline is fixedly arranged in the torque transmission sleeve, and the axis of the torque transmission sleeve is collinear with the axis of thebarrel. A discharge hole for discharging gas and liquid in the cylinder is formed in the upper cover, and a hoisting part is fixedly arranged on the upper cover. The slag discharging device is movablysleeved on the drill rod, and can be pulled out from the drill rod when drilling slag needs to be discharged, so that the slag discharging efficiency of drilling is greatly improved, and the slag discharging device has the ad