The invention relates to the technical field of power systems, and particularly relates to a bird-caused damage risk distribution map drawing system, which can reflect a distribution condition of bird-caused damage risks happening to an overhead transmission line in a selected region. Collection of basic data, statistical analysis of the basic data, drawing of a green map, drawing of a migratory bird migration channel map, drawing of a bird-caused damage distribution map, building of a bird resource distribution database, drawing of the bird-caused damage risk distribution map and modification of the bird-caused damage risk distribution map are carried out. According to the bird-caused damage risk distribution map, the grade of the bird-caused damage risks happening to the overhead transmission line can be reduced significantly. An important role is played in maintaining safe and stable operation of the overhead transmission line, a favorable guarantee is provided for safe operation of the transmission line, and unnecessary economic losses brought to power equipment due to bird-caused damages can be reduced.