The invention provides a drug liquid vibration backflow type medical cotton processing method through a position reading device. The drug liquid vibration backflow type medical cotton processing method utilizes a medical cotton processing device which comprises a drug liquid container (2) which is in a cuboid structure; shafts (4) are installed on two relative short face plates of the cuboid in a rotatable mode; rotors (3) are fixed on the shafts (4); the shafts (4) are in power connection with an electric motor (41); the shapes of the rotors (3) are square quadrangular columns which are provided with the square sections; filter grids which are arranged in an array mode are arranged on every side of the square quadrangular column; the shapes of the filter grids are squares; every lateral wall (31) of the filter grids is made of filter screens and is perpendicular to the surface of the square quadrangular; every filter grid is used for holding the medial cotton.