The utility model discloses a condensed water discharging device for a centrifugal fan. The condensed water discharging device comprises a water drain opening and a water drain pipe, wherein the water drain opening is vertically arranged at the bottom of the centrifugal fan in a downward mode, the water drain pipe is horizontally or slantly arranged and connected with the water drain opening, one end of the water drain pipe is closed, the other end of the water drain pipe is a condensed water discharging outlet, and an injector pipe inlet is arranged at the closed end of the water drain pipe; an injector pipe enters into the water drain pipe through the injector pipe inlet, the injector pipe is used for blowing compressed air into the water drain pipe, and the front end of the injector pipe penetrates through the lower portion of the water drain opening and extends toward the condensed water discharging outlet. According to the condensed water discharging device for the centrifugal fan, a negative pressure zone is formed in the water drain pipe, so that condensed water in the fan is accelerated to flow toward the water drain pipe through the water drain opening, the condensed water and impurities mixed in the condensed water can be taken out, the water drain opening is prevented from being blocked, and a series of problems caused by the blocking of the water drain opening are avoided.