Unmanned helicopter tail transmission structure

The invention discloses a tail transmission structure of an unmanned helicopter, belongs to the technical field of transmission devices of unmanned helicopters, and solves the problems that a tail transmission line of the unmanned helicopter is long, a tail transmission shaft is easy to deform greatly in the transmission process and can vibrate violently, and meanwhile, the tail transmission shaft is not easy to deform in the vibration process. The tail transmission structure comprises a deep groove ball bearing, a tail transmission shaft support, a tail transmission shaft positioning sleeve, a tail transmission shaft and a tail transmission shaft supporting cylinder. The tail transmission shaft is coaxially installed in the tail transmission shaft supporting cylinder through a tail transmission shaft support. The more than two tail transmission shaft supports are uniformly distributed along the length direction of the tail transmission shaft; and each tail transmission shaft support is coaxially sleeved on t