The invention discloses a method and equipment for simulating rain drops of window glass and wiping effect of a windscreen wiper in rainy days, and the method comprises the steps: building a three-dimensional space model of a vehicle windscreen, putting the model into a uv coordinate system, cutting the model into a plurality of equant grids, and taking each grid as a coordinate system for drawing water drops; fitting a noise function, a pull-up function and a motion curve function, calculating a pull-up value of an X axis and a motion value of a y axis for a water drop, calculating a water drop coordinate and a pixel deviation value, calculating a trailing water drop coordinate and a pixel deviation value, and superposing the coordinates and the pixel deviation value into a pixel deviation value; performing offset sampling on the original image to obtain a water drop sliding image, and performing fuzzy algorithm processing to obtain a simulated water vapor effect image; calculating two radian distance fields, and superposing the two radian distance fields into one radian distance field; and mixing the simulated water vapor effect image and the original image through a radian distance field to obtain a final simulated effect image. The simulation reality sense is greatly improved, simulation is easily and quickly deployed, the effect is better, and the efficiency is better.