The invention discloses a seven photoelectric switch arc array and method for vehicle navigation edgewise, and relates to the technical field of automatic navigation. The array consists of seven identical photoelectric switches arranged in arc-shaped and even arrangement. When the road edge is in an ideal target band, a vehicle is in an ideal pose without adjustment. When the road edge is out of the ideal target band, the method automatically selects a corresponding navigation trajectory curve according to the high-low level state, which is determined by a signal trigger number Nd and a trigger center sequence number Nf, of the seven photoelectric switch arc array, and determines the parameters of the navigation trajectory. Through regulation and control, the vehicle returns to the ideal target band, and navigation control edgewise is carried out on the vehicle. Through the high-low level change of seven photoelectric switches in arc layout along the side of the vehicle, accurate pose detection and navigation edgewise are carried out on the vehicle along the road edge. The seven photoelectric switch arc array and method are suitable for bump road edge anti-collision and anti-drop automatic navigation edgewise of a sinking road edge, and have the advantages of simple structure, simple control, high adaptability and good practicality.