The utility model relates to the technical field of circulating water descaling, in particular to a cooling circulating water descaling device which comprises a descaling cylinder. The device further comprises a filter screen and a cover plate fixing
assembly. The outer side of the descaling cylinder is fixedly connected with a support frame, the upper end of the descaling cylinder is provided with a top cover, the upper end of the top cover is fixedly connected with a water inlet
pipe, the outer side of the descaling cylinder is fixedly connected with a water outlet
pipe, the lower end of the descaling cylinder is fixedly connected with a blow-off
pipe, and one side of the blow-off pipe is provided with an electric valve; according to the device, a driving motor is started, the driving motor drives a rotating rod to rotate, the rotating rod drives a fixing frame to rotate, a first spring elastically supports a sliding rod, the sliding rod drives a cleaning
brush to abut against the inner wall of a filter screen through a connecting plate, the fixing frame drives the sliding rod to rotate, and the sliding rod drives the cleaning
brush to rotate through the connecting plate, so that
dirt on the inner wall of the filter screen is brushed away; then the electric valve is started, and
dirt is discharged through the blow-off pipe, so that the replacement frequency of the filter screen is reduced, the service life of the filter screen is prolonged, and the descaling efficiency of cooling circulating water is improved.