The invention discloses a JF-2 type transmission patrol line airship tail fin comprising two upper vertical tails and a lower vertical tail; the two upper vertical tails form a V shape and the two upper vertical tails and the lower vertical tail form a Y-shaped tail fin. The included angle between the two upper vertical tails is 120 DEG. Included angles between the lower vertical tail and the upper vertical tails are 120 DEG. Two upper vertical tails and the lower vertical tail form three control planes which swing and turn at the same time. The Y-shaped tail fin is fixed at a rear of a boat capsule. The Y-shaped tail fin air turning of the invention is transformed from the past hanging tail swinging up and down to three control planes swinging and turning simultaneously. The area of a rudder body is 30% larger than that of traditional cross empennages, and the turning resistance of rudder surface is increased by 30% to 35% and airship turning flexibility is improved. The invention reduces the influence of the large volume of the air bag of the electric helium airship, improves the operation and the empty time of the airship, and is applied in the electric power line patrol field.