The invention discloses a method for designing an overhead transmission line engineering tree felling map. The method comprises the following steps: obtaining a tree felling width data original tableand a tower detail table; based on the tree felling width data original table and the tower detail table, calculating the felling width of the tree outside the side wire; solving cross arm lengths oftower positions one by one based on the tower detail list and the cross arm lengths of different tower types; adding the length of the cross arm at the tower-by-tower position and the tree felling width outside the side wire to obtain the felling width outside the gear-by-gear center line of various trees in the whole line; drawing a ladder-shaped tree felling width interval plane graph of the required tree species based on the felling width data outside the gear-by-gear center line; and completing tree felling construction drawing according to tree information of plane graph. According to themethod, the coordinate graph of the tree felling width interval can be drawn, and the efficiency and precision of field work are improved.