The invention provides a power transmission line information inquiry method, which is used for a mobile terminal integrated with an electronic map. The method comprises the following steps of receiving a power transmission line inquiry instruction from a user, wherein the inquiry instruction comprises a target line mark; obtaining power transmission line information of a target line from prestored line information according to the target line mark, wherein the power transmission line information of the target line comprises position information of the target line and configuration information of the target line; matching the position information of the target line with position formation in the electronic map; obtaining a target position of the target line in the electronic map; marking the configuration information of the target line in the target position. By using the scheme, the power transmission line information inquiry is completed through the mobile terminal; the defects of slow operation speed and carrying inconvenience of the power transmission line information inquiry system in the prior art are overcome; in addition, the portability and the accuracy of the power transmission line information inquiry are improved; the application range of the power transmission line information inquiry is enlarged.