In view of the variable speed and variable form characteristics of the tilt six-ducted propeller unmanned aerial vehicle during transition flight, based on the principles of flight dynamics, a method for determining its tilting transition corridor is proposed. Through dynamic trim, based on the low-speed and high-speed boundary constrained by the wing lift characteristics, combined with the available power limit of single-ducted propellers, the tilt transition corridor of the tilt six-ducted propeller unmanned aerial vehicle is drawn. The results show that the tilt six-ducted propeller unmanned aerial vehicle has the ability to complete the tilt transition at different pitch angles; the required power of the front and middle ducted propellers gradually decreases with the increase of the forward speed, while that of the rear ducted propellers first decreases and then increases with the increase of the forward speed; the low-speed boundary of the tilt transition corridor for the tilt six-ducted propeller unmanned aerial vehicle is formed by the combined constraints of the low-speed boundary determined by the lift characteristics of the wings and the available power limit boundary of a single ducted propeller. The research work has certain research significance for the optimization selection of the tilt transition path and the tilt control strategy of the tilt six-ducted propeller unmanned aerial vehicle.