The utility model discloses a cooling device for distributing rollers of a printer. The cooling device comprises a condensed water pipe, a rotary connector and a cooling water tank. Each distributing roller body is a hollow roller with two closed ends; each distributing roller body is bridged between an operation wallboard and a transmission wallboard through rotary shafts at two ends; the rotary shaft at one side of the operation wallboard is a hollow shaft head; the cavity of the hollow shaft head is communicated with the cavity of each distributing roller body; the condensed water pipe passes through the cavities of the hollow shaft head and the distributing roller bodies; a plurality of water outlets are radially and uniformly distributed on one section of wall face in the cavity of each distributing roller body at intervals; the rotary connector is provided with a water inlet pipe, a water return pipe, a water inlet pipe connector and a water return pipe connector; the rotary connector is communicated with the condensed water pipe through the water inlet pipe of the rotary connector, and the water return pipe of the rotary connector is connected with the outer end of the hollow shaft head by means of being communicated with a space between the outer surface of the condensed water pipe and the inner wall face of the cavity of the hollow shaft head; furthermore, the water inlet pipe connector and the water return pipe connector are respectively communicated with a water outlet and a water inlet on the cooling water tank through a water supply pipeline.