The invention provides a preparation method for a corrosion-resistant fracture-resistant coated woven bag. The preparation method comprises the following concrete steps: adding all the components of agranulating material into a mixer for uniform mixing, and putting the uniform mixed material into an extruder for extrusion of a film; cooling the extruded film in cold water and cutting the cooled film into blank filaments, putting the cut blank filaments in an oven for drawing into flat filaments, putting the flat filaments into a knitting machine for knitting so as to form a plastic woven fabric, and rolling the plastic woven fabric for subsequent usage; putting all the components of a coating material into a mixer for stirring so as to form a mixture, and putting the mixture into a single-screw squeezing granulator for extrusion so as to form a coated fabric; and attaching the coated fabric onto both sides of the plastic woven fabric, carrying out unwinding at the same time, performing stitching by using a heat sealing device so as to form a coated woven fabric, putting the coated woven fabric into a cutting machine, performing cutting according to a predetermined size, and sewingthe cut coated woven fabric to obtain the coated woven bag. The preparation method for the coated woven bag in the invention is simple in production process, and the produced coated woven bag has high corrosion resistance and good fracture resistance.