Preparing maltitol crystals by evapo-crystallization, comprises preparing a maltitol solution； concentrating the maltitol solution under vacuum in evapo-crystallizing dish to obtain maltitol syrup； seeding the maltitol supersaturated solution with a dispersed crystalline maltitol seed； conducting the crystallization by constant maintaining the degree of maltitol supersaturation in the metastable zone of the maltitol by controlling temperature conditions, by strong agitation by pumping of evaporation steam, and by feeding into maltitol syrup to be crystallized； and recovering the obtained crystals. Process for preparing maltitol crystals by evapo-crystallization, comprises preparing a maltitol solution with richness in dry maltitol of 85%, preferably 93-95%； concentrating the maltitol solution under vacuum in evapo-crystallizing dish to obtain a maltitol syrup of which the degree of maltitol supersaturation is located in metastable zone of the maltitol； seeding the maltitol supersaturated solution with a dispersed crystalline maltitol seed； conducting the crystallization by constant maintaining the degree of maltitol supersaturation in the metastable area of the maltitol by controlling temperature conditions, by strong agitation by pumping of evaporation steam, and by feeding into maltitol syrup to be crystallized； and recovering the obtained crystals.
