A tail fin connected mechanism comprises a tail fin connected rod, wherein one end of that tail fin connecting rod is connected with an aircraft body and the other end is connected with a tail fin assembly, and the tail fin assembly and the tail fin connected rod are detachably and fixedly connected; The tail fin assembly comprises a tail fin front flange and a tail fin rear flange sleeved on thetail fin connecting rod, and the tail fin front flange and the tail fin rear flange are fixed with the tail fin connecting rod by bolts; Two tail cross rods are bolted on the front flange and the rearflange of the tail, and the tail cross rods are symmetrically arranged on both sides of the axis line of the tail connecting rod. A tail rib is detachably connected at both ends of that tail cross bar; The tail wing connecting mechanism provided by the invention connects the body and the tail wing assembly through the tail wing connecting rod, and the structure of the tail wing assembly is reasonable and stable, so that the tail wing structure is convenient to disassemble and assemble as a whole, the portability is good, the maintenance is convenient, and the maintenance difficulty of the tail wing is reduced.