The inclined paper tape filter is a new type of filtering device for filtering the emulsion by the filter paper. The oblique filter does not need a chain net and the motor is driven by the front motor, and the used filter cloth is pulled out of the filter. At the same time, the front of the filter is provided with a scraping board to scrape off the impurities adhering to the filter cloth. Because the inclined filter has a temporary storage function, it can filter a relatively large flow rate with a small filter area. The inclined filter is used for installation of small space, and can be used for filtration of CNC machine tools, filtration of grinding machines, filtration of high-frequency welded pipe coolant.