The invention provides a high lift-drag ratio and low torque characteristic 9%-thickness rotor-wing airfoil suitable for all working conditions. The applicant comprehensively utilizes various optimization strategies to make up for the solution shortcomings of the current optimization algorithm for multi-design point and multi-constraint problems and improve the conventional airfoil parameterization method; according to the working states of different profiles, different aerodynamic analysis algorithms are used, so that an aerodynamic numerical solution is efficiently and accurately obtained. The high lift-drag ratio and low torque characteristic 9%-thickness rotor-wing airfoil suitable for all the working conditions is obtained in a given working state, and maneuvering and hovering lift-drag ratios of a rotor wing are improved, so that the 9%-thickness rotor-wing airfoil is suitable for the blade design of the high-speed rotor wing. Compared with the existing 9%-thickness rotor-wing airfoil, the 9%-thickness rotor-wing airfoil provided by the invention improves the maneuvering and hovering lift-drag ratios of the rotor wing and further increases the efficiency of the rotor wing, thus having good engineering practicality.