The utility model provides an energy-saving device for cleaning water of a
slag-flushing rotary drum, which comprises a
slag-flushing circulating
system, a first valve, a second valve and a
slag-flushing master control chamber, and the slag-flushing circulating
system comprises a slag-flushing circulating water pump, a flushing box and a rotary drum; the rotary drum is connected with the slag flushing circulating water pump through a pipeline, and a seventh valve is arranged on the pipeline; the slag flushing circulating water pump is connected with the flushing box through a pipeline, and an eighth valve is arranged on the pipeline; the
punching box is connected with a drum through a pipeline, the drum is connected with a
nozzle, and the
nozzle is connected with an external
water supply mechanism through a pipeline; one end of the first valve is connected with a pipeline between the slag flushing circulating water pump and the eighth valve through a pipeline, and the other end is connected with the
nozzle through a first pipeline; the second valve is connected to a pipeline between the nozzle and the external
water supply mechanism; and a
control system is arranged in the slag flushing master control chamber. According to the utility model, the pipeline, the valve and the
control system are arranged, so that the quantity of drum cleaning water entering the slag flushing circulating
system is reduced.