The invention discloses a regional 
fishing device for circulating-water 
cage culture. The device includes at least one breeding tank, wherein an 
aeration water-pushing module is arranged at one end ofeach breeding tank, a 
sewage collection module is arranged at the other end, and each breeding tank includes a canvas trough body which is arranged in a 
buoyancy frame; circulating net 
drying modulesare fixed at both ends of each canvas trough body separately, each circulating net 
drying module includes a ring-shaped net which is arranged in a frame body, and chain transmission can be formed byeach ring-shaped net after each ring-shaped net is driven; net change is performed through circulating movement of the ring-shaped nets for a distance, each breeding tank is also provided with at least one regional dividing module, and a canvas is divided into at least two regions by a regional cross bar; each 
aeration water-pushing module is arranged outside the corresponding circulating net 
drying modules, and is used for carrying out 
aeration and pushing water for the corresponding breeding tank, each 
sewage collection module includes a diversion area and a collection area, and the outsideof each diversion area communicates with the corresponding collection area; and 
sewage which is pushed out of each breeding tank is introduced into one collection area through the corresponding diversion area, and then 
dirt is drained away through suction. 
Fishing of 
cage culture can be facilitated, cleanliness, aeration and 
water exchange of net cages are ensured, and functions of collection anddischarge of sewage are achieved.