Method and system for detecting illegal permission of installed application program based on mobile terminal

The invention relates to a method and a system for detecting illegal permission of an installed application program based on a mobile terminal, and belongs to the field of computer software, the method comprises the following steps: acquiring permission information and category information of a target application program; obtaining a preset permission database, wherein the permission database comprises a plurality of permission data packets; according to the category information of the target application program, matching a corresponding data packet, and calculating violation authority of the target application program and violation weight information of the opened authority; matching the current risk level in a preset risk level table according to the violation weight information; judging whether the target application program is used for the first time or not; if not, obtaining a previous risk level of the target application program, and obtaining a risk level growth rate based on the previous risk level an