Ultrapure water improving device

The ultrapure water improving device comprises a pure water storage tank, a UV sterilizer, a post-filter and a heat exchanger, the UV sterilizer is installed at the water outlet end of the pure water storage tank, the water inlet end of the UV sterilizer is communicated with the water outlet end of the pure water storage tank, the post-filter is installed on the UV sterilizer, and the heat exchanger is communicated with the water inlet end of the UV sterilizer. The water inlet end of the post-filter is communicated with the water outlet end of the UV sterilizer; the UV sterilizer can remove various bacteria causing secondary pollution in the pipeline at the water outlet end of the pure water storage tank, the prerequisite condition that the bacteria breed on the pipe wall is blocked, the probability that moss and stains are accumulated on the inner wall of the pipeline is effectively reduced, the probability that ultrapure water is subjected to secondary pollution is reduced, and the service life of the ultra