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Magnesium sulphate heptahydrate was added to the hot distillation tank containing 80-90 degrees C, stirred while heating, dissolved to 1.21g/cm3 in mass concentration, removed impurities such as arsenic and heavy metals by alkali, decolorized by activated carbon after filtration, concentrated to 1.370g/cm3-1.384g/cm3 in mass concentration, cooled and crystallized, separated and washed at 25-15 degrees C, dried in a vibrating fluidized bed at 50-55 degrees C. Different grades of high purity magnesium sulfate heptahydrate were obtained with different water quality, impurity removal, decolorization and washing degree.