The invention belongs to the technical field of tunnel engineering, and particularly discloses a tunneling device and method adopting laser cutting for rock breaking. The tunneling device comprises aself-travelling mechanism, a connecting mechanism and a cutting mechanism; the self-travelling mechanism is used for achieving moving of the whole tunneling device; the connecting mechanism comprisesa main driving shaft, a swing arm and an auxiliary driving shaft which are connected sequentially; the cutting mechanism comprises a laser cutterhead mounted on the auxiliary driving shaft and a plurality of laser cutting heads which are mounted on the laser cutterhead and arranged in a crossed mode in the horizontal direction and the vertical direction; and a distance sensor is further mounted onthe laser cutterhead to detect the distance between the laser cutterhead and a to-be-cut rock layer. The tunneling method adopts the tunneling device to break rock so as to achieve tunneling. The loss of a cutter is avoided, cutter replacing is not needed, and the cutting efficiency is high.