The invention provides an electronic mail cleaning method. The method comprises the steps of determining candidate electronic mails according to a date range selected by a user; calculating first weight scores of the candidate electronic mails according to identifiers of the candidate electronic mails; calculating second weight scores of the candidate electronic mails according to a contact person database stored at a server side; calculating third weight scores of the candidate electronic mails according to preset contents in the corresponding contact person information; calculating fourth weight scores of the candidate electronic mails according to the number of mails sent in a short time; multiplying the first, second, third and fourth weight scores, thereby obtaining total weight scores; and sorting the candidate electronic mails according to the corresponding total weight scores from high to low, thereby carrying out cleaning according to selection of the user. According to the electronic mail cleaning method provided by the invention, the user is helped in cleaning the electronic mails rapidly; and the trouble and time are reduced.