[PROBLEMS] To provide a system for a dialysis treatment, whereby the safety during the dialysis treatment can be elevated and the disinfection operation can be easily automated, and a disinfection method thereof. [MEANS FOR SOLVING PROBLEMS] A system for a dialysis treatment having a purified water-producing unit (1) by which purified water can be produced, a receiver unit (2) to which the purified water produced in the purified water-producing unit (1) is supplied and in which a dialysis fluid having a definite concentration or a stock solution for dialysis can be prepared by using the purified water, and a water-supplying channel (L5) for supplying the purified water produced in the purified water-producing unit (1) to the receiver unit (2), wherein the purified water-producing unit (1) has a hot disinfectant solution-preparing means for preparing a hot disinfectant solution and the hot disinfectant solution prepared by the hot disinfectant solution-preparing means is supplied to the receiver unit (2) via the water-supplying channel (L5).
