Road ground seam cutting device and using method thereof

The invention provides a road ground seam cutting device and a using method thereof, and belongs to the technical field of road construction.The road ground seam cutting device comprises a U-shaped main frame, two side position tripods, a polygonal shaft, a cutting mechanism, a driving mechanism and an adjusting mechanism, and the two side position tripods are symmetrically arranged and fixedly connected to the inner walls, close to each other, of the U-shaped main frame; positioning parts are arranged at the triangular parts, and the two positioning parts located on the same straight line form a pair; the polygonal shaft is rotationally connected between one pair of positioning parts; the two groups of cutting mechanisms are movably arranged on the polygonal shaft and are used for cutting a road at the same time to obtain two ground seams; the distance between the two ground seams can be directly adjusted without detaching the blade, adjustment can be conducted according to the condition of the ground needin