Decision to accept a valid application: 227231/QĐ-SHTT.IP (03/10/2025). This invention, in the field of mechanical engineering and aerospace, relates to the mechanical structure and landing gear mechanism of multi-rotor unmanned aerial vehicles, specifically an improved landing gear design for self-balancing and shock absorption during landing. The goal of this invention is to propose a landing gear mechanism for multirotor unmanned aerial vehicles (UAVs). Specifically, the landing gear mechanism is capable of automatically adjusting the length of the landing gear using a screw mechanism combined with the UAV's sensor system to determine whether the UAV is balanced. This allows for independent control signals to adjust the landing gear dimensions, ensuring safe landings on rough or uneven terrain.