Low-damage wool fabric sand-washing finishing process

The invention discloses a low-damage wool fabric sand-washing finishing process, aiming at solving the problem that a conventional sand-washing process causes large strength damage to a wool fabric. The low-damage wool fabric sand-washing finishing process comprises the following steps: putting the wool fabric dyed by acid dye or reactive dye in an acid-resisting oxidation-resisting mesh bag, then putting in an industrial washing machine, and controlling the pH value to be in the range of 4.2-4.8; heating to 60-80 DEG C, adding 0.5-10% o.w.f (On weight the fabric) of a strong oxidant to the industrial washing machine, and carrying out sand washing, wherein potassium permanganate or compound type potassium permanganate releasing body is adopted as the strong oxidant; cooling to 45-55 DEG C, carrying out wash washing, and adding 4-6% o.w.f of a softening agent; and then dewatering, and drying. According to the low-damage wool fabric sand-washing finishing process, the wool fabric has an obvious second-hand finishing effect through the synergistic effect of a specific pH value and the strong oxidant, and the strength damage caused by the conventional sand-washing process is effectively avoided.