The invention discloses full-automatic tunnel longitudinal cutting equipment, and belongs to the technical field of engineering machinery. The method is mainly used for solving the problems that the efficiency is low and the safety risk is high when blasting, mechanical air pickaxe or tunnel circular cutting equipment is adopted to remove lining concrete cracks. The equipment is mainly characterized by comprising an automobile running device, a sliding rail, a sliding mechanism, a rotating device, a mechanical arm device, a longitudinal moving rail, a hydraulic wall saw and a numerical controlhydraulic system; the sliding mechanism is arranged on the sliding rail arranged on the automobile running device; the mechanical arm device is at least a telescopic three-link arm structure, the lower end of the mechanical arm device is connected with the sliding mechanism through the rotating device, and the upper end of the mechanical arm device is connected with the longitudinal moving rail;the hydraulic wall saw is arranged on the longitudinal moving rail; and an adjusting oil cylinder and a connecting rod mechanism are arranged between the longitudinal moving rail and the mechanical arm device. The equipment has the advantages of high automation degree, simplicity in operation and remarkable improvement of construction efficiency, and is mainly used for quickly dismantling lining concrete of tunnels with existing diseases.