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This invention provides a method for rapidly maturing newly reclaimed severely saline-alkali land, comprising: sequentially performing the following steps in the newly reclaimed severely saline-alkali land: returning straw to the field, burying underground pipes, digging open ditches, flood irrigation to leach salt, applying base fertilizer, rotating leafy vegetables, and applying foliar fertilizer. The base fertilizer is a root-growth promoting fertilizer, and the leafy vegetables are selected from one or more of amaranth, Chinese cabbage, spinach, or bok choy. This method for rapidly maturing newly reclaimed severely saline-alkali land combines leafy vegetable rotation with root-growth promoting fertilizer to achieve ecological restoration and improvement of the land, thereby achieving the goal of controlling saline-alkali soil and increasing the output benefits of saline-alkali agriculture.