Self -cleaning filtering device

The utility model discloses a self -cleaning filtering device for solving current automatic backwash filter structure complicacy and back flush and cleaning and filtrating the not thorough technical problem in layer, this filter equipment includes: the fixed subassembly of the jar body, back flush module, filter layer, water intake pipe, outlet pipe way, back flush pipeline, discharge pipeline, first fixed subassembly and second, the back flush module includes: hollow shaft and a plurality of nozzle, first fixed subassembly, jar body and hollow shaft enclose into airtight chamber, back flush pipeline and airtight chamber intercommunication jointly, be provided with the intercommunicating pore on the hollow shaft, airtight chamber communicates with the first space that the middle part of hollow shaft, a plurality of nozzle, filter layer enclose through the intercommunicating pore in proper order, first fixed subassembly, jar body, the fixed subassembly of second and filter layer enclose into second space, wate