To provided a filtration type dust correction apparatus and a filtration type dust collection method capable of reducing treatment cost by reducing the consumption amount of a reaction assistant, removing dust stuck to the filter medium and surely reducing dust amount for disposal after collection.

This filtration type dust correction apparatus is provided with the filter medium receiving the reaction assistant and dust for collecting dust, a filtering type dust collector 1 having a washing mechanism removing dust attached to the filter medium, and a magnetic separator 4 capable of supplying the reaction assistant magnetized as the reaction assistant, and removing the magnetized reaction assistant from the collected dust.