The invention relates to the technical field of tunnel rock mass tunneling blasting engineering. The slotting structure comprises blastholes distributed on a blasting network, wherein the blastholes comprise middle slotting holes (1), left slotting hole (2) and right slotting holes (3); the middle slotting holes (1) are uniformly distributed in the middle part of the tunnel face of a tunnel in a Tand Inverted T combined shape, a symmetry center line of the middle slotting holes (1) are overlapped with a center line (4) of the tunnel face of the tunnel, the left slotting holes (2) are formed in the left side of the center line (4), and the right slotting holes (3) are arranged on the right side of the center line (4). According to the slotting structure and the slotting method, the defectthat blasting is incomplete due to the fact that the distance between the hole openings of the slotting holes is too large is overcome by increasing the T and Inverted T combined shaped reinforced slotting holes, and the tunnel blasting excavation speed is increased to a certain extent.