The invention discloses a pair of convenient and fast insulating sheath installation pliers. The convenient and fast insulating sheath installation pliers comprise an arc-shaped right plier bar and an arc-shaped left plier bar mutually hinged and mounted through a pin shaft I, as well as an arc-shaped right plier arm and an arc-shaped left plier arm hinged to and mounted with the lower ends of the left plier bar and the right plier bar through a pin shaft II and a pin shaft III. When the right plier arm and the left plier arm rotate downwards to be in contact with a stop dog I and a stop dog II respectively, a locking mechanism is adopted to lock the positions of the right plier arm and the left plier arm, and at the moment, the right plier arm and the left plier arm are pinched to drive the left plier bar and the right plier bar to be close to each other, and metal sheathes of insulating sheathes positioned in the arc-shaped plier openings of the left plier bar and the right plier bar are extruded by convex heads in the left plier bar and the right plier bar to be fixed on an electric wire. After the convenient and fast insulating sheath installation pliers are used, the locking device is unlocked, and the right plier arm and the left plier arm are turned over upwards to accommodate the insulating sheath installation pliers, so that a worker can conveniently carry the insulating sheath installation pliers along.