A method for absorbing and utilizing waste gas chlorine hydride generated by manufacturing of chemical engineering products includes that, according to the technical scheme supplied by the invention, waste gas chlorine hydride generated by manufacturing of chemical engineering products is absorbed by ethanol instead of water, wherein, a chemical general expression of the ethanol is ROH, and the Rof the expression is 1-8 carbon atoms; when the chlorine hydride in an absorption caldron reaches a state of saturation in the ethanol, the saturated solution can be placed in a reaction caldron provided with a condenser, and the chlorine hydride can be discharged under the normal atmosphere and the temperature ranging from 40 to190 DEG C; after the discharge of the chlorine hydride, temperature of the solution in the reaction caldron raises by 50-210 DEG C, and extra ethanol in the solution is discharged under the normal atmosphere; after the discharge of the extra ethanol, remainders in thereaction caldron are neutralized by alkaline material to the pH value of 6.5-7.0, and then are delaminated by means of sedimentation, dewatered, distilled, thus obtaining a remainder finished product. The invention is utilized to absorb and utilize waste gas chlorine hydride, so that the environmental pollution can be reduced and the production cost is lowered.