The utility model provides a dirt absorbing device and pond recirculating aquaculture system, this system comprises parts such as pushing away wetting system, running water breeding pond group, discarded object sedimentation tank, dirt absorbing device, quality of water purification pond. This dirt absorbing device mainly includes PVC pipe, U type pipe, suction pump, washer pump, blow off pipe. The PVC pipe is connected through U type pipe, forms a long tube that is " S " type, and PVC pipe wall equipartition is equipped with netted aperture. The immersible pump is all installed at the long tube both ends, and the one end that is located the bank is the suction pump, and the during operation will deposit the discarded object intake pipeline on bottom of the pool and PVC pipeline to extractto the effluent water sump along with water, the immersible pump of the long tube other end is the washer pump, when the suction pump soil pick -up is obstructed, closes the suction pump, opens the washer pump, with water from the pond in the suction pipe, the filth that will block up on the aperture washes. The utility model discloses the soil pick -up is efficient, and simple structure, complete equipment lie in the bottom of the pool, has avoided exposing to the weather, and parts are not fragile.