The 304 precision filtration flat screen paper tape filter machine magnetic roller paper tape filtration device consists of a liquid tank, a collection tank, a non-woven fabric/paper tape filter, a magnetic roller separation device, a reducer, a transmission mechanism, a signaling mechanism, a liquid pump, and other components. The contaminated liquid containing a large amount of impurities during work is first separated by a magnetic roller separation device (optional when there are many magnetic impurities in the filtered liquid. Secondary filtration is implemented to improve the filtration effect.)