The invention discloses a classification model optimization method and a classification model optimization apparatus, belonging to the technical field of information. The method comprises the following steps of: according to a first class identifier determined while classifying a target email based on a first classification model, storing the target email in a first email folder corresponding to the first class identifier; when an operation of moving the target email from the first email folder to a second email folder is defected, determining a second class identifier corresponding to the second email folder; according to at least one characteristic set of the target email, acquiring characteristic vectors of the target email; and training according to the characteristic vectors of the target email, the second class identifier, the characteristic vectors of a plurality of sample emails and corresponding class identifiers, and obtaining a second classification model. The second classification model is generated according to the second class identifier corresponding to the target email, thus, classification habit of users is learnt more, accuracy of email classification is improved, efficiency of email management of the users is improved, and an effect of accurate classification of the emails is achieved.