The vertical take-off and landing fixed-wing UAV has the advantages of convenient use and superior performance, and is the key direction for the development of UAVs in the future.The vertical take-off and landing fixed-wing UAV is designed with the drooping tail of the wing tip to be used as a vertical tail with both wingtips and landing gear.In order to understand the aerodynamic influence of the wing tip vertical tail on the whole of the UAV, the paper compares the four wingtip designs of the drooping tail, upper vertical tail, wing tip end plate and conventional layout.The aerodynamic characteristics of the four designs are simulated and analyzed by using LBM-LES algorithm and the wall self-adaptive local vortex viscous large eddy simulation turbulence model.The analysis results show that the drooping tail of the wing tip is more efficient than the other three designs in the leveling state; the stability against the crosswind is better in the vertical takeoff or landing state.