The device is especially suitable for all kinds of special machine tools which produce small chips or large amount of grinding chips and require higher precision of chip fluid. When working, the filter drum is automatically cleaned, continuous filtration, maintenance-free, which can fully meet the needs of special machine tools in complex working conditions, such as chip hedging, spindle internal cooling and tool cooling. * Because the special machine tool has higher requirements for the amount of chip removal, the accuracy of chip fluid (oil), flow and pressure, the user needs to provide relevant technical parameters when ordering, so as to design the scheme.