Drill

The invention discloses a drill. The drill comprises a drill assembly and a pipeline assembly. The drill assembly comprises a fixed post, a first grinding portion, a second grinding portion, a cuttinghead and water outlets, wherein the fixed post is arranged on the upper surface of a drill handle and fixedly connected to the drill handle, and the first grinding portion is arranged on the lower surface of the drill handle and fixedly connected with the drill handle. After a user fixedly connects the whole drill assembly with a drill machine, cooling liquid is fed into cylindrical water inlet pipes from water inlets through a high pressure water injector and then flows through curved type water inlet pipes, the interior of the first grinding portion and the interior of the second grinding portion are cooled conveniently, finally the cooling liquid is sprayed out of the water outlets in the lower end face of the cutting head, and the cutting head is cooled; and meanwhile, dust generateddue to cutting can be humi