The invention relates to the technical field of navigation of substations, in particular to a method for positioning and navigating the yard of a substation based on a mobile phone APP (application) tool. The method comprises the following steps of 1, downloading software, applying for a user, and opening different user authorities; 2, downloading a latest map offline packet; 3, querying the basic conditions of the yard of the substation, and determining a target yard; 4, positioning the position of the user; 5, planning an optimum route, and navigating; 6, finishing the navigation, and feeding back; 7, determining the feedback contents. The method has the advantages that the target yard is determined according to the basic information of the yard, the optimum route is calculated according to the historical route, and the navigation is performed in character and voice types; the information querying, positioning and route navigation functions can be realized, an operation and maintenance person can correctly and efficiently complete daily operation, maintenance, yard finding and navigation in the operation and maintenance process, the maintenance task is timely performed, the operation and maintenance efficiency is improved, and the reliability of power supply is improved; by adopting personalized setting, the operability and the accuracy in navigation can be effectively improved.