The subject innovation relates to an excavator rock drilling device for connecting like excavators puncturing or breaking the rock to the rock, is fixed to one side of the upper side of the frame bar, both sides of the frame bar to be formed toward the opposite sides species between the upper plate and a lower plate connected to the excavator and a connection frame which, rock and the cylinder having a cylinder rod the upper part of the upper plate, and a hydraulic motor for the cylinder elevating and connected to a hydraulic motor connected to the end of the shaft, a shaft which rotates with the bit to excavate bedrock in the drilling rig, is to form the upper plate and the lower plate slide member forming a guide rod fixed to the screw, and inserts a shaft for said guide rod and rotated by the hydraulic motor connected by flanges to the end of the cylinder rod W , and so fall is made, near the end of the shaft for rotation by said hydraulic motor, cold With water heureumwa center in which each number of insertion operating lever to form a discharge port, and the outer peripheral surface of the shaft to form a mulgong geupgu which cooling water is inserted into the space portion and the cooling water that is inserted into the slide member, elevating the cylinder rod of the cylinder to be provided with a control panel has, the subject innovation are possible accurate vertical motion is made excavate the rock in the exact position of the bit, and also be a hydraulic line failure during operation to prevent the device or personal injury, improve the working efficiency, the shaft there is a cooling effect that increases increase the durability of the equipment.