A slope sliding area assessment method, wherein same belongs to the technical field of slope stability evaluation and disaster prevention and control. The method comprises: firstly, calculating an initial sliding surface corresponding to the minimum safety coefficient of a slope, and an initial sliding area and an initial dead weight corresponding to the initial sliding surface; then covering a possible sliding region of the slope, randomly generating several feasible sliding surfaces to simulate the possible sliding region of the slope, and calculating a secondary safety coefficient of the feasible sliding surfaces; and finally, regarding the feasible sliding surfaces having a secondary safety coefficient less than or equal to one as secondary failure sliding surfaces, then calculating the area of each of the secondary failure sliding surfaces one by one, carrying out non-repeated accumulation on all the secondary failure sliding areas and the initial sliding area, and finally assessing a slope sliding area using the accumulated value. In the method, a slope sliding area error value obtained by means of calculation is relatively small, and the consequences brought about by slope sliding can be preliminarily evaluated by means of a slope sliding area.
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