The invention discloses a desulphurization wastewater sludge treatment device. The desulphurization wastewater sludge treatment device comprises a clarifier, a sludge pump, a slurry blanking hole and a vacuum belt conveyor, wherein a pipeline at the lower end of the clarifier is connected to the slurry blanking hole, and the slurry blanking hole is connected to the vacuum belt conveyor; slurry in a desulphurization absorption tower is fed to a gypsum hydrocyclone station by virtue of a gypsum discharging pump, and a gypsum slurry blanking hole of the gypsum hydrocyclone station is connected to the vacuum belt conveyor; and the slurry blanking hole is arranged at the rear end of the gypsum slurry blanking hole. The desulphurization wastewater sludge treatment device has the beneficial effects that after bottom sludge passes through a vacuum belt dehydrating system, a byproduct gypsum is generated, recycling of the bottom sludge is realized, and the discharge problem is solved; energy consumption is low, and stability is good; investment and cost for operation and maintenance are low, and floor area is zero; and compared with the original system, filter press equipment and an auxiliary system thereof are eliminated, a mechanical uniform distribution device (containing no running motor) is added, and a sludge delivery pipeline is changed while energy consumption is almost not increased; besides, investment cost is low, maintenance is simple, and floor area is small.