The invention relates to a drilling machine cooled through motor-driven water spray. Based on the structure of an existing drilling machine, a built-in electronic-control water spray cooling mechanismis introduced; an inner barrel channel is designed for a driving rotary rod on a main body motor control terminal (1); on the basis that a minisize water tank (3) is designed to be put into the mainbody motor control terminal (1), a specific designed motor driving circuit (9) is combined, and a minisize air pump (8) is controlled intelligently; the minisize water tank (3) is inflated; and wateris directly guided into a sleeve drill bit (2) through a water pipe (4) penetrating the channel and directly acts on the working sleeve drill bit (2), so that constructors do not need to additionallyconduct watering and cooling operation. The integral structure of a designed drilling machine maintains appearance design the same as that of the existing drilling machine, and work efficiency of thedrilling machine can be effectively improved.