The invention discloses an automatic export method of rail transit line drawing data. The method includes the following steps of designating main line initial primitives, processing the property information of the initial primitive, recognizing all main line primitives and exporting the property information, recognizing the number of crossovers directly connected with a main line and the number of turnouts contained by the crossovers, determining the opening direction of the crossovers, determining the types of the turnouts contained by the crossovers and exporting the property information, recognizing sublines connected with the crossovers, determining the previous primitives and subsequent primitives of the sublines, the starting points of the sublines and the kilometer posts of subsequent rails and exporting the property information, iteratively recognizing crossovers and sublines not connected with the main line, determining the number and types of the turnouts contained by the crossovers and the starting points and kilometer posts of the sublines and exporting the property information, recognizing a car stop and exporting the property information, and recognizing a slope and a road and bridge tunnel and exporting the property information. The comprehensive design quality and level of a rail transit project can be improved, and the risk of train operation accidents can be reduced.