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This invention belongs to the field of dialysis powder preparation, specifically relating to a porous, fast-dissolving sugar-containing dialysis powder and a method for preparing the porous, fast-dissolving sugar-containing dialysis powder based on freeze-drying spray. The method includes the following steps: (1) concentrating the sugar-containing dialysis solution to obtain a concentrated solution; (2) atomizing the concentrated solution and freezing the resulting atomized droplets to obtain solid ice crystal particles; (3) sublimating and drying the solid ice crystal particles under reduced pressure to obtain the porous, fast-dissolving sugar-containing dialysis powder. This dialysis powder is prepared using a specific freeze-drying spray technology, possessing the characteristics of porous particles, uniform composition, and rapid dissolution, while significantly reducing transportation volume and cost.