The invention relates to a crystallization technical method for industrially producing trehalose. According to the crystallization technical method for industrially producing the trehalose, in industrial production, by utilizing the characteristics of trehalose mixed sugar liquid, crystalline trehalose is produced quickly and largely by adopting the following four steps of (1), performing high-temperature low-pressure sugar boiling: quickly concentrating the trehalose mixed sugar liquid until a highest critical concentration at which a crystal is separated out is reached; (2), quickly cooling and crystallizing: putting the trehalose mixed sugar liquid into a crystallization tank, and carrying out the quick cooling and crystallization in a natural condition without adding any eluting agent and crystal seed; (3), replenishing an appropriate amount of water for dissolving heterogeneous sugar: when the trehalose mixed sugar liquid is cooled to be at a room temperature and the crystal is completely separated out, adding cold pure water in a certain proportion into the trehalose mixed sugar liquid, so as to dissolve most of the heterogeneous sugar on the surface of the crystal; (4), centrifuging an obtained mixture at a low speed, and naturally air-drying an obtained product, so as to obtain high-purity crystalline trehalose, and completely recycling and reusing centrifuged mother liquid. The method provided by the invention has the advantages of being short in period, high in efficiency, low in energy consumption, free from pollution and zero in release; the product made by the crystallization technical method is safe and a user can be unworried.