The invention discloses a condensing demisting anti-gypsum rain integrated device for a wet desulphurization system. The condensing demisting anti-gypsum rain integrated device comprises an inlet flue, an A-shaped heat pipe beam, a dirt wastewater collecting device, a desulfurizing tower inlet flue, a desulfurizing tower, a desulfurizing tower outlet flue, a B-shaped heat pipe beam, a condensate water draining device, a middle flue, de-scaling nozzles and an outlet flue, wherein the A-shaped heat pipe beam is located between the inlet flue and the outlet flue; a heat absorbing end is located in the inlet flue while a heat releasing end is located in the outlet flue; the B-shaped heat pipe beam is located between the desulfurizing tower outlet flue and the middle flue; the heat absorbing end of the B-shaped heat pipe beam is located in the desulfurizing tower outlet flue while the heat releasing end is located in the middle flue; the de-scaling nozzles are arranged at the top ends of the heat absorbing ends of the A-shaped heat pipe beam and the B-shaped heat pipe beam; the dirt wastewater collecting device is arranged at the bottom end of the A-shaped heat pipe beam; the condensate water draining device is arranged at the bottom end of the B-shaped heat pipe beam; a stirring unit is arranged in the condensate water draining device. The condensing demisting anti-gypsum rain integrated device has the advantages of low system cost, high desulphurization efficiency, anti-scaling property, easiness in cleaning and capability of effectively preventing the gypsum rain from forming.