A shredder dust treatment method of further collecting metal scraps from a residue such as shredder dust in which valuable materials such as metal and non-ferrous metal are separated from a material obtained by crushing wastes such as waste automobiles, waste home appliances, and waste office furniture and processing a remaining residue into a useful industrial material, comprising: a crushing step of crushing the wastes into a predetermined size; a primary dust collecting step of collecting fibrous dust separated by the crushing step; an iron component separation and collection step of separating and collecting a magnetic material containing an iron component in a crushed material obtained by the crushing step; a non-ferrous component separation and collection step of using a homopolar magnet to separate and collect a non-ferrous component which is not picked up by a magnetic force and is contained in the crushed material separated by the iron component separation and collection step; a step of separating and collecting stainless steel which is not separated by the non-ferrous component separation and collection step and is discharged while being contained in non-metal by the combination of a metal detector and an air jet nozzle of ejecting jet air; a wind power sorting step of sorting the crushed material separated by the metal component separation and collection step into lightly floating fibrous dust and a settled crushed material; a shredding step of shredding particulate dust separated by settling in the wind power sorting step into a predetermined size; a secondary dust collecting step of collecting the fibrous dust generated by the shredding step; a stirring step of separating the fibrous dust and the particulate dust shredded and crushed by the shredding step while tapping the dust in a metering feeder by a stirring blade; and a fibrous dust/particulate dust separation step of separating the crushed material shredded by the shredding step into fibrous dust and particulate dust, wherein the fibrous dust generated when being separated by each of the crushing step, the primary dust collecting step, the non-ferrous component separation and collection step, the wind power sorting step, the secondary dust collecting step, the stirring step, and the fibrous dust/particulate dust separation step is collected, and wherein the particulate dust separated by the fibrous dust/particulate dust separation step is collected. a crushing step of crushing the wastes into a predetermined size; a primary dust collecting step of collecting fibrous dust separated by the crushing step; an iron component separation and collection step of separating and collecting a magnetic material containing an iron component in a crushed material obtained by the crushing step; a non-ferrous component separation and collection step of using a homopolar magnet to separate and collect a non-ferrous component which is not picked up by a magnetic force and is contained in the crushed material separated by the iron component separation and collection step; a step of separating and collecting stainless steel which is not separated by the non-ferrous component separation and collection step and is discharged while being contained in non-metal by the combination of a metal detector and an air jet nozzle of ejecting jet air; a wind power sorting step of sorting the crushed material separated by the metal component separation and collection step into lightly floating fibrous dust and a settled crushed material; a shredding step of shredding particulate dust separated by settling in the wind power sorting step into a predetermined size; a secondary dust collecting step of collecting the fibrous dust generated by the shredding step; a stirring step of separating the fibrous dust and the particulate dust shredded and crushed by the shredding step while tapping the dust in a metering feeder by a stirring blade; and a fibrous dust/particulate dust separation step of separating the crushed material shredded by the shredding step into fibrous dust and particulate dust, wherein the fibrous dust generated when being separated by each of the crushing step, the primary dust collecting step, the non-ferrous component separation and collection step, the wind power sorting step, the secondary dust collecting step, the stirring step, and the fibrous dust/particulate dust separation step is collected, and wherein the particulate dust separated by the fibrous dust/particulate dust separation step is collected.