Tunnel blasting drilling device

The invention belongs to the technical field of tunnel blasting, and particularly relates to a tunnel blasting drilling device which comprises an equipment base, a seat is fixedly mounted on the outer surface of the upper end of the equipment base, and a rotary supporting column is fixedly connected to the outer surface of the upper end of the equipment base. The telescopic rod can stretch out and draw back on the inner wall of the outer sleeve through the spring, so that the dust cover can be pushed forwards to be tightly attached to the blasting surface through the elastic force of the spring, and the dust is prevented from seeping out of the edges of the dust cover and the blasting surface; and by utilizing the contractibility of the spring, when the drill bit drills into the blasting surface, the dust cover is driven to contract backwards, so that the normal drilling of the drill bit is not influenced, and the situation that the sight of an operator is influenced by a large amount of dust generated when t