The utility model relates to a frequency modulation type self -excited oscillation fluidic device, its casing, bottom plate, the import of vertical efflux, rectification cavity, mixed flow cavity, jet exit and import of tangential efflux that includes tubulose open structure, casing bottom opening part and bottom plate fixed connection, the casing top is provided with the import of vertical efflux perpendicularly, vertical efflux import entry end and back flush tube coupling, vertical efflux import exit end and the rectification cavity intercommunication that is located casing upper portion, be located the casing, set gradually passageway and mixed flow cavity below the rectification cavity, rectification cavity below and channel entrance intercommunication, above the passageway export was located mixed flow cavity entrance, the mixed flow cavity exports wore out bottom plate and jet exit intercommunication, it forms efflux integration region to be located between passageway export and the mixed flow cavity entry, be located passageway upper portion, the interval is provided with tangential effluxs import a plurality of and passageway upper portion intercommunication on the lateral wall of casing upper portion. The utility model discloses practice thrift the energy consumption, avoid filter screen local deformation that too high surge pressure leads to, damaged scheduling problem washes out.