Compared to quadcopters, fixed-wing aircraft offer higher efficiency, longer flight times, and greater range. However, their larger wings and bodies make them bulky, requiring more space for takeoff and landing and reducing portability. This is the trade-off for their aerodynamic advantages. Traditional fixed-wing designs have not addressed these issues well; their fixed, non-detachable bodies make transportation inconvenient and attract unwanted attention. Additionally, the simplistic and unreliable designs often lead to crashes, and the image transmission quality is unsatisfactory. All these factors make what should be an elegant flight experience less graceful—until the arrival of the FireFly Multifunctional Modular Fixed-Wing UAV.The entire FireFly UAV features a modular quick-release design, including the wings, tail, and nose, allowing for easy replacement of any damaged module. All necessary components for flight, such as the aircraft, remote controller, batteries, propellers, charger, and spare nose, can be stored in a portable EPP case for convenient transport and effortless enjoyment of flying.The FireFly features a full high-wing configuration, with all avionics modules and the battery compartment located in the fuselage. This design simplifies maintenance and combines the inherent stability of a high-wing with enhanced maneuverability achieved through a specially balanced wing shape. The fuselage is made from high-strength, silver EPP foam with internal carbon fiber reinforcement, paired with black reinforced plastic. This not only improves the overall aesthetic but also enhances the structural integrity of the aircraft.