The invention belongs to the corn starch production technology field by a wet method, particularly relates to a use method of dry waste heat in the production process of corn starch and equipment thereof. The technical proposal of the invention is as follows: the waste heat use equipment in the production of corn starch comprises a fourth-effect evaporator, a washing tower, a flash evaporator, a corn steep liquor can and a corn soak solution can; the fourth-effect evaporator comprises a first-effect heating room, a first-effect separator, a second-effect heating room, a second-effect separator, a third-effect heating room, a third-effect separator, a fourth-effect heating room, a fourth-effect separator, and a condenser which are connected by pipelines; only the first-effect heating room is supplied with fresh steam; the second-effect heating room and the third-effect heating room respectively use secondary emission of a tube bundle and the tube bundle, and heat of condensed water by air drying for heating; and the fourth-effect heating room uses the waste heat and secondary steam of the first-effect heating room, the second-effect heating room and the third-effect heating room for heating. The invention can reduce the amount of fresh steam, and is a measure which can not be ignored for saving energy, reducing consumption, and increasing benefits of the enterprise.