A kind of exchange purifier in cultivation fish pond, including stirring settler, biological purification plant, chlorination equipment, water storage discharging device;Stirring settler includes sedimentation basin, mixing part, precipitation strainer, gettering component, suction pump, biological purification plant includes purification bottle, active carbon layer, biologic packing material, big suction pump, force (forcing) pump, aeration circle, solarization air cap, aerator, the water inlet end of chlorination equipment is connected with the top of biological purification plant, and the water outlet of chlorination equipment is connected with water storage discharging device;Water storage discharging device includes cistern, rotating device, outlet pipe, PH sensor, water outlet pump, PH sensor is installed on the inner wall of cistern, water outlet pump is provided in cistern, rotating device is installed at the top of cistern, outlet pipe is installed on the spinning device, and outlet pipe is connected with suction pump.The present invention has many advantages, such as that good purification, effect on environment are small.The invention belongs to technical field of sewage.
