Circulating filtration system of ammonia water tank

The invention belongs to the technical field of desulfurization and denitrification, and discloses an ammonia water tank circulating filtration system which comprises a first ammonia water tank, a second ammonia water tank, a circulating connection pipeline and a filter part. The first ammonia water tank and the second ammonia water tank are both configured to be communicated with an ammonia water tank car and used for storing ammonia water, and the first ammonia water tank and the second ammonia water tank are respectively communicated with the ammonia water evaporator and used for providing ammonia water for the ammonia water evaporator; the circulating connecting pipeline comprises a first branch and a second branch, the first branch and the second branch are both connected between the first ammonia water tank and the second ammonia water tank, the first branch is used for directionally guiding ammonia water from the first ammonia water tank to the second ammonia water tank, and the second branch is used f