The invention relates to equipment for dehydrating plaster slurry generated by a flue gas wet desulphurization technology, in particular to an efficient disc filter cloth dehydrator. The efficient disc filter cloth dehydrator comprises a tank body, wherein a tank body water filling opening is formed in the upper part of the tank body; a millhole is formed in the bottom of the tank body, and a main shaft is arranged in the middle at the upper part of the tank body; two ends of the main shaft are supported on a corresponding bearing seat in a rotating manner, and two ends of the main shaft are respectively connected with a driven end distribution head and a driving end distribution head; a plurality of filtrate pipes are uniformly distributed on the circumference surface of the main shaft, and two ends of each filtrate pipe are connected with an axle head pipe at the end part of the main shaft; a plurality of dehydration disks are uniformly distributed on the filtrate pipe in the length direction, and each dehydration disk is formed by splicing a plurality of sector plates; a filter cloth sleeves each sector plate. The efficient disc filter cloth dehydrator is high in vacuum utilization rate, low in operating cost, small in floor space, high in treatment capacity, and low in failure rate, maintenance, and comprehensive operating cost of a complete machine.