Provided are a method and a system for analyzing image data obtained by photographing a bridge by a drone using artificial intelligence, rapidly and accurately finding a part that requires maintenance of the bridge, and calculating a maintenance solution and a maintenance estimate for the part. The system for maintaining a bridge by analyzing bridge image data received from a drone using artificial intelligence, includes: the drone that photographs the bridge to generate the bridge image data; and an artificial intelligence bridge maintenance apparatus that finds a part of the bridge requiring maintenance, and calculates an optimal maintenance solution and an optimal maintenance estimate necessary for the bridge maintenance.