The invention relates to the field of a chemical industrial apparatus, and specifically relates to a preparation apparatus of anhydrous sodium sulphate. The apparatus includes a filtering mechanism, a crystallization mechanism, a drying mechanism and a conveying mechanism. A filtering pot includes a pot body, an installation table is arranged around an inner wall of the pot body, and sieves are cooperatively installed on the installation table. A continuous crystallization part comprises a crystallization kettle, the lower end of the crystallization kettle is provided with a crystallization discharge port, a disc centrifuge matching the crystallization discharge port is installed at the crystallization discharge port, and a crystal discharging pipe of the disc centrifuge communicates with a material inlet of a drying mechanism. Two ends of a coil pipe are connected to a refrigeration circulating pump, and a settlement pot is provided with a crystal discharge port which communicates with the disc centrifuge. The drying mechanism is a fluidized bed, and the conveying mechanism matching a charging end of the fluidized bed is installed at the charging end and is a closed auger conveyer. The purity of aqueous glauber salt is improved, and impurities in aqueous glauber salt are reduced. The aqueous glauber salt refining efficiency is high, the quality of aqueous glauber salt is good, and the aqueous glauber salt can be fully recycled. The anhydrous sodium sulphate is high in conveying speed and good in quality.