The invention relates to a mobile terminal and a positioning method thereof. The method comprises the following steps of receiving a positioning capability reporting request sent by a positioning server; according to the positioning capability reporting request, reporting positioning capability information to the positioning server; receiving a positioning information obtaining request generated by the positioning server according to the reported positioning capability information; and, according to the positioning information obtaining request, obtaining corresponding positioning information from a pre-set positioning information database, reporting the corresponding positioning information to the positioning server, and positioning the geographical position of the mobile terminal by the positioning server according to the reported positioning information, wherein the positioning information in the positioning information database is obtained by recording system messages of cells, where the mobile terminal lingers. By means of the method, the mobile terminal can be positioned rapidly; and furthermore, the power consumption of the mobile terminal can be reduced.