The invention relates to a circulating ammonia gas recovery apparatus, which is provided with an ammonia gas tower, wherein a recovery pool is arranged beside the ammonia gas tower, a recovery pipeline is arranged between the recovery pool and the ammonia gas tower, a spraying nozzle is arranged in the ammonia gas tower, the outer side of the ammonia gas tower is provided with an induced fan, a water pipe is connected to the spraying nozzle, the water pipe supplies a water source to the spraying nozzle, and ammonia gas enters the ammonia gas tower and is sprayed by the spraying nozzle. According to the present invention, the recovery pool is arranged on the circulating ammonia gas recovery apparatus so as to discharge the wastewater in the ammonia gas tower into the recovery pool, such that the ammonia water in the recovery pool can be recycled, and the circulating ammonia gas recovery apparatus can be conveniently and efficiently used, and can perform multiple recycling; and the spraying nozzle performs the spraying operation on the ammonia gas, such that the working effect of the ammonia tower is good.