The embodiment of the invention discloses a method and a device for standardizing text information. In the embodiment of the invention, for nonstandard text information used for describing medical relevant affairs in a medical system, a possibility that the nonstandard text information and each piece of alternative standard text information are both used for describing the same medical relevant affair can be obtained through a Bayes classification algorithm model according to the associated information of the nonstandard text information; and then, on the basis of the probability, one part of standard text information can be selected from all alternative standard text information, and therefore, target standard text information used for standardizing the nonstandard text information can be searched only from the part of standard text information. Therefore, a range for searching the target standard text information for the nonstandard text information is greatly reduced, so that manual work is simplified, and manual burdens are lightened.