The utility model discloses a self -cleaning filter that is used for dry -method acetylene generator pulp water retrieval and utilization pipeline, including casing, reduction gear, shaft coupling, transmission shaft, packing seat, filter screen and scrubbing brush, import, the first takeover of access connection have been seted up to the casing middle part, the casing bottom is equipped with the export, and the exit linkage second is taken over, the retarder connection shaft coupling, coupling joint transmission shaft one end, the transmission shaft other end is equipped with the scrubbing brush, be equipped with the packing seat on the transmission shaft, the carbon fiber coil pipe is established in the import top in the packing seat on the packing seat, the filter screen is the vertical cylinder form, locates the import below, and in the scrubbing brush stretched into the filter screen, its brush finish contacted filter screen. The utility model discloses can clear up the fine particle of adhesion on the filter screen, make fine particle pass through the filter screen, avoid the jam of filter screen to can guarantee the steady operation of generator.