An arrangement method of exploration survey lines for a railway tunnel with an airborne electromagnetic method effectively explores geological conditions of a underground section at a center line of arailway line, so as to ensure reliability of geophysical data and realize economical efficiency, rationality and high efficiency of the exploration project as best as possible. The exploration surveylines comprise a central survey line arranged at the center line of the railway line; a left-side survey line group and a right-side survey line group that are arranged on the left side and the rightside of the center line in the direction of the railway line respectively. In the left-side survey line group and the right-side survey line group, the survey lines are symmetrically arranged with respect to the central survey line, and the spacing between the survey lines at the same side is gradually changed from the smallest spacing between the survey lines closest to the central survey line to the largest spacing between the survey lines farthest away from the the centrak survey line. The spacing between the survey line nearest to the edge in the left-side survey line group and the surveyline nearest to the edge in the right-side survey line group is twice as much as the depth of tunnel exploration. The lengths of the central survey line, the survey lines in the left-side survey linegroup and in the right-side survey line group are the sum of the tunnel length and the length of extended segment extending outward from both ends of the tunnel.