Method for preparing glycine based on solvent effect

The invention relates to the technical field of amino acid production, in particular to a method for preparing glycine based on a solvent effect, which comprises the following steps: dissolving ammonium chloroacetate and urotropine in a binary mixed solvent, introducing ammonia gas, heating and reacting, cooling and crystallizing a reaction product, and centrifugally collecting crystals to prepare glycine, wherein a filtrate 1 is collected after a reaction product is centrifuged, reduced pressure distillation water outlet is carried out, the mass of the reduced pressure distillation water outlet is 75%-80% of the total mass of water in the binary mixed solvent, cooling and centrifugation are carried out after reduced pressure distillation, ammonium chloride crystals are prepared, and a filtrate 2 is collected after centrifugation; and supplementing the water obtained by reduced pressure distillation into the filtrate 2, and returning to the reaction system for reuse. According to the method, the glycine with