The invention provides a GIS-based power transmission line intelligent patrol inspection system, which a comprises server and a mobile terminal, wherein an electronic map is set up in the server, and the server and the mobile terminal performs exchange and sharing with each other through a network; a user authority management module, a pole tower data management module and a status patrol inspection management module; and an electronic sign-in module, a map editing module, a positioning module, a line patrol trajectory recording module, an off-line data module, an instant communication module, a data interaction module and a query statistics module are installed in the mobile terminal. The GIS-based power transmission line patrol intelligent inspection system integrates the computer technology, the GIS technology and the 3G wireless communication technology, inputs power transmission line basic data, personnel attendance information, line defect information and the like into the system in standard forms, reduces the workload of patrol intelligent staff, and effectively solves the problems of low personnel attendance rate and poor real-time performance in patrol inspection; and the GIS-based power transmission line patrol intelligent inspection system can learn about the operating conditions of a power transmission line comprehensively, and discover and solve the problems of defects and hidden dangers in the power transmission line timely.