The invention relates to a nap opening and impurity removing device, and belongs to the technical field of mechanical or high-pressure cleaning of textiles or fiber products. The device comprises a machine box. A conveying belt moving in the clockwise direction is arranged in the machine box, a swing sieve is arranged below the conveying belt, two connecting rods are hinged to the upper surface ofthe swing sieve, the lower surface of the swing sieve is fixedly connected with two fulcrum rods, the inner wall of the machine box is rotationally connected with an eccentric wheel, and elastic ropes are connected between the eccentric wheel and two fixed wheels. An oscillating sieve is arranged below the swing sieve, two springs are fixedly connected between the bottom of the oscillating sieveand the machine box, a disc is rotationally connected into the machine box, a rocker is fixedly connected to the disc, and a lever mechanism is mounted at the bottom in the machine box. According to the technical scheme, the problem that impurities cannot be removed when nap is opened in the prior art is solved, the whole process is safe and reliable, and high practicality is achieved.