Special sterilizing tank for treating sewage by utilizing ultraviolet rays

The invention relates to a sewage treatment tank, in particular to a special sterilizing tank for treating sewage by utilizing ultraviolet rays. The sterilizing tank comprises a rectangular tank body, wherein at least three coiled pipes are distributed averagely on a bottom plate of an inner chamber of the rectangular tank body; the top part and the bottom part of each coiled pipe are provided with a connection pipe head which is communicated with the inner chamber of the coiled pipe; the bottom ends of the coiled pipes prop against an inner bottom plate of the rectangular tank body; the top ends of the coiled pipe are lower than an opening of the rectangular tank body; the connection pipe heads of the two adjacent coiled pipes of the at least three coiled pipes are connected in series into a whole so that the heads and the tails of the at least three coiled pipes form a one-way flow channel; the coiled pipes, the connection pipe heads and the connection pipes are all made of transparent materials; a lamp tub