The embodiment of the invention discloses a method and device for determining coincided road sections. The method comprises the steps that by a spatial index algorithm, a surrounding first road section subset is acquired from a first road section set of first road network data for each second road section in second road network data; from a second road section set of the second road network data, a surrounding second road section subset is acquired for each first road section in the first road network data; according to projection point positions between the road sections, the first road section in the surrounding first road section subset nearest to the second road section, as well as the second road section in the surrounding second road section subset nearest to the first road section are determined respectively; and when the shortest first road section and the shortest second road section are mutually nearest to each other, a coincided part is deemed to exist. The method disclosed by the invention has the advantages that through the manner, repeated operations and data resource waste can be reduced, and update and integration efficiency of a road network can be increased during road network updating on the premise that existence of the coincided part is known.