The invention provides an industrial production method of icodextrin. The industrial production method comprises steps as follows: a, an acid solution with the concentration of 0.3%-1.5% is prepared; b, 1,000 parts by weight of the acid solution are taken, 400-450 parts by weight of corn starch are added to the acid solution during stirring, the mixture has a hydrolysis reaction for 1-2 h at the hydrolysis temperature of 90-95 DEG C, and then pH is regulated to 5-7, and a hydrolysis product is obtained; c, the hydrolysis product prepared in the step b is cooled to 55-60 DEG C, 12-13.5 parts by weight of activated carbon is added, decoloration is performed for 0.5-1 h, and filtration is performed after decoloration; d, a filtrate prepared in the step c is subjected to ultrafiltration and drying, and icodextrin is obtained. According to the industrial production method of icodextrin, the preparation process is simple, the production cost is low, a prepared product has good quality, and the industrial production method is applicable to industrial mass production of icodextrin.