The utility model provides a sewage softening installation, include: the unboiled water jar, the softening jar, the water inlet of unboiled water jar and softening jar is linked together, and the delivery port and the outside of softening jar are linked together, are provided with the softening structure in the softening jar, and the bottom of softening jar has the drain, the counterflush structure, the counterflush structure links to each other with the softening jar to make the regeneration of softening structure, the reverse supplementary structure of washing backward supplementary is washed the structure and is included the counterflush head, washes the head and sets up in the softening jar, and the counterflush head is linked together with the unboiled water jar to make sewage softening installation counterflush head when the counterflush wash in to the softening jar. The technical scheme of the utility model the sewage treatment device life cycle of having solved effectively among the prior art is short, and higher problem is rateed to equipment trouble.