The invention provides a normal temperature fabric rinsing reagent for a non-aqueous solution system and belongs to the technical field of household and industrial rinsing. The operating method comprises the following steps: dissolving an N-acyl lactam compound bleaching activator into an organic solvent, and adding a nonionic surfactant and a pH regulator in a certain ratio so as to obtain a liquid rinsing reagent; and adding a certain amount of peroxide, and effectively rinsing under the room-temperature and nearly neutral conditions. The peroxide can release hydrogen peroxide in water under the room temperature conditions and further acts with the N-acyl lactam compound bleaching activator so as to produce a peroxy acid with high reaction activity, so that colored stains on the fabric are effectively removed, and fibers are not obviously damaged. The problem that the cationic bleaching activator is easy to absorb water is solved; and the normal temperature fabric rinsing reagent is prepared into a liquid reagent, so that application of the reagent in the household and industrial fields is greatly promoted.