Device and method for preparing gypsum from wet desulfurization sludge

The invention provides a device and method for preparing gypsum from wet desulphurization sludge, and the device comprises a discharging and drying unit which comprises a sludge discharging assembly, a slurry discharging assembly, a flushing assembly and a dewatering part; desulfurized sludge and flushing water output by the sludge discharging assembly and the flushing assembly respectively are mixed to generate slurry, and the slurry is discharged into the downstream dewatering part. Gypsum slurry output by the slurry discharging assembly is discharged into the downstream dewatering part; wherein the dewatering part extends horizontally, the drainage point of the gypsum slurry is located at the first-section dewatering position of the dewatering part, the drainage point of the slurry is located at the downstream of the first-section dewatering position, and the distance between the drainage point of the slurry and the first-section dewatering position is a set value; the control unit comprises a controller,