The invention discloses a portable bag of a handheld terminal for inspecting an extra high voltage line facility. The portable bag comprises a rectangular portable bag main body, wherein the portable bag main body is provided with a notepaper groove, a mounting groove and a sliding cover groove; a clapboard is arranged between the notepaper groove and the mounting groove; the sliding cover groove is provided with two dovetail grooves which are positioned on the left side and the right side of the notepaper groove respectively; a sliding cover is arranged and positioned in the sliding cover groove and is provided with two guide blocks; the two guide blocks are matched with the sliding cover groove; the sliding cover is provided with a handheld terminal mounting sleeve; the handheld terminal mounting sleeve is positioned in the mounting groove; the side wall of the portable bag main body is provided with a rectangular turning cover; the turning cover is hinged with the portable bag main body; the portable bag main body is provided with positioning cloth; one end of the positioning cloth is connected with the portable bag main body; the positioning cloth is provided with an elastic fastening belt and a male buckle; and the rear part of the portable bag main body is provided with a female buckle. The portable bag is a bag which is particularly used for accommodating the handheld terminal, is convenient to carry and can also protect the handheld terminal from being damaged by the exterior.