Method for designing safe take-off trajectory of unmanned aerial vehicle under wet and slippery runway

The invention provides a method for designing a safe takeoff trajectory of an unmanned aerial vehicle on a wet and slippery runway, which comprises the following steps of: acquiring performance parameters such as a taxiing friction coefficient, takeoff thrust, a maximum climbing angle and a lift-drag coefficient of the unmanned aerial vehicle in a taxiing takeoff process, and establishing a takeoff and taxiing balance equation of the unmanned aerial vehicle in combination with the runway length of a flight task and the mass of the unmanned aerial vehicle; iteratively solving the takeoff and taxiing balance equation of the unmanned aerial vehicle to obtain the taxiing distance of the unmanned aerial vehicle on the wet and slippery runway; setting a safe track point required to be reached in the take-off and climbing process of the unmanned aerial vehicle and a position where the unmanned aerial vehicle stops running and starts to climb; the climbing angle of the unmanned aerial vehicle is calculated, and an un