Power transmission line step voltage-based device for acquiring electric energy and application method of device

The invention relates to the field of power taking of a power transmission line, in particular to a power transmission line step voltage-based device for acquiring electric energy and an application method of the device. The power transmission line step voltage-based device for acquiring electric energy comprises rear-end equipment, front-end equipment and a high-conductivity insulation wire, wherein a central control module is used for controlling a first roller and a second roller to drive and proceed so as to achieve an inspection proceeding task of power transmission line inspection equipment and controlling a voltage between a step voltage acquisition end A and a step voltage acquisition end B, power is supplied by a storage battery when the device for acquiring the electric energy is in an initial state or other non-working states, the voltage between the step voltage acquisition end A and the step voltage acquisition end B is raised to obtain an appropriate voltage by coordinated voltage of the central