Disclosed in the present invention is an unmanned aerial vehicle three-dimensional trajectory design method based on a wireless energy transmission network. The method comprises: establishment of a downlink channel model of a wireless energy transmission network; establishment of a mathematical model based on maximization of energy harvested by a user, comprising three-dimensional position deployment, charging time allocation, and energy beam pattern generation of an unmanned aerial vehicle; design and analysis of a low-complexity iterative algorithm for jointly optimizing the three-dimensional position deployment, charging time, and energy beam of the unmanned aerial vehicle; and design of an unmanned aerial vehicle three-dimensional flight trajectory by a branch and bound method. The present invention proposes to apply three-dimensional energy beamforming technology to a wireless energy transmission network, establish a mathematical optimization problem, of the network model, based on the maximization of energy harvested by a user, and apply a low-complexity iterative algorithm to jointly optimize the three-dimensional position deployment, charging time, and energy beam pattern of an unmanned aerial vehicle, so as to maximize the energy harvested by the user in a coverage area while meeting altitude and coverage area restrictions of the unmanned aerial vehicle.
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