The invention provides a preparation method for spun-bond composite non-woven fabric for electric conduction-toughening. The non-woven fabric is made by three raw materials including polymer chips, one-dimensional electric conduction nanometer filler and a dispersing agent. The method specifically comprises courses including (1) preparation of electric conduction master batches and (2) preparation of the spun-bond composite non-woven fabric for the electric conduction-toughening. The method is characterized in that shearing and collision during high-speed mixing and the synergistic effect of the dispersing agent are applied, and uniform dispersing of the one-dimensional electric conduction nanometer filler in a polymer can be achieved through a double-screw extruder; and tube-type airflow drafting effects in a spun-bond method is used, so the one-dimensional electric conduction nanometer filler can be oriented along the axis direction inside the fiber and on the fiber surface, construction of electric conduction grids can be ensured, and an electric conduction percolation threshold value of the composite material can be reduced significantly. The spun-bond composite non-woven fabric for the electric conduction-toughening can effectively achieve integral design of structural-functional modification of the composite material. Steps are single; operations are convenient; and practicability is high.