Method for automatically arranging abrupt slope embankment and calculating overbreak large step engineering quantity

A method for automatically arranging a steep slope embankment and calculating overbreak large step engineering quantity comprises the steps that coordinate data of each node of a ground line in a section are recognized and recorded in AutoCAD, the width of an overbreak step and the average thickness of a covering layer are set, the starting point and the ending point of the overbreak step are selected on the ground line, and the overbreak large step engineering quantity is calculated; the method comprises the following steps of: calculating the coordinate point of each step through the coordinate point of a ground line, then calculating the end point coordinate of each step through the coordinate point of the ground line, then performing polyline drawing on the end points of the steps to realize automatic arrangement of overexcavation steps on the cross section, then performing polyline drawing on the points on the ground line and the end points of the steps, and defining a regular graph among the polylines t