The basket filter is mainly composed of a nozzle, a main pipe, a filter blue, a flange, a flange cover and fasteners. When the liquid enters the filter blue through the main pipe, the solid impurity particles are blocked in the filter blue, while the clean fluid passes through the filter basket and is discharged from the filter outlet. When cleaning is required, unscrew the screw plug at the bottom of the main pipe, drain the fluid, remove the flange cover, and reinstall it after cleaning. Therefore, it is extremely convenient to use and maintain.