This paper introduces a novel design for a biomimetic flapping wing Unmanned Aerial Vehicle (UAV) that employs multi-point airfoil control and a bespoke control strategy to manage its intricate nonlinear dynamics. The primary objective is to address the shortcomings of existing designs by developing a highly stealthy and adaptable UAV solution to cater to the demands of contemporary warfare. Through an analysis of practical applications, we construct a dynamic model for altitude control. This model considers factors such as aircraft mass, aerodynamic drag, and external conditions to derive the system’s nonlinear dynamic equations. Our study introduces a nonlinear backstepping method to design an efficient controller, which enables precise altitude control. MATLAB-Simulink simulations, when compared with traditional Proportional-Integral-Derivative (PID) control methods, reveal the superior performance and robustness of our strategy in various environments. This research not only enhances military capabilities and meets the needs of modern warfare but also provides valuable insights for future un-manned aircraft design and control.