The utility model relates to a protection architecture of last communication optical cable of transmission line has solved easy damage not enough of the communication optical cable among the prior art. The utility model provides a pair of protection architecture of last communication optical cable of transmission line, first protective sheath and second protective sheath play the effect of protection communication optical cable, avoid the animal to gnaw the skin of stinging the communication optical cable, have prolonged the life of communication optical cable, the fastener is used for fixing the communication optical cable by the fixture, and the member plays the effect that prevents the animal climbing with the globoid that sets up on the member, forms clearance fit between globoid and the member, and the globoid can rotate on the member, and the animal can't be stood on the globoid, can avoid the animal to utilize the globoid climbing effectively from this, and then has avoided the communication optical cable because external action power and with other parts like overhead line tower contact and wearing and tearing, has lengthened the life of communication optical cable.