Tunnel pre-slot-cutting machine and guidance system thereof

The invention relates to a tunnel pre-slot-cutting machine and a guidance system of the tunnel pre-slot-cutting machine. The tunnel pre-slot-cutting machine comprises two common points and a machining axis segment, wherein the coordinates of the common points and the coordinates of the end points of the machining axis segment in a first coordinate system fixed relative to a machine body of the tunnel pre-slot-cutting machine are known. The guidance system comprises a measuring unit and a control unit, wherein the measuring unit is used for measuring the coordinates of the two common points in a second coordinate system fixed relative to a tunnel and measuring two inclination angles of the machine body of the tunnel pre-slot-cutting machine in the two perpendicular directions fixed relative to the machine body; the control unit is used for calculating the positional deviation between the machining axis segment of the tunnel pre-slot-cutting machine and a preset line of the tunnel according to the coordinates of the two common points in the first coordinate system and the second coordinate system, the two inclination angles, the coordinates of the end points of the machining axis segment in the first coordinate system, and the coordinates of the preset line of the tunnel in the second coordinate system. The tunnel pre-slot-cutting machine further comprises the guidance system.