The invention discloses an attitude control mechanism for a twin-rotor unmanned aerial vehicle. The attitude control mechanism comprises a left screw propeller, a right screw propeller, a left control surface assembly, a right control surface assembly, a steering engine and a steering engine connecting rod. By adopting the structure, the attitude control mechanism can be used as the attitude control mechanism for a transverse twin-rotor unmanned aerial vehicle and a longitudinal twin-rotor unmanned aerial vehicle as the same time; and pitching, yawing and roll attitudes of the unmanned aerial vehicle can be flexibly adjusted in the parallel sailing or vertical flight process to complete high-difficulty complicated motion. The rotating position of a control surface basically overlaps with an aerodynamic center of the control surface, so that the work load of the steering engine is reduced and the control surface with relatively high stress can be driven by a small-moment steering engine. Meanwhile, the control surface assemblies are connected with an unmanned aerial vehicle body through a control surface mounting rod, the aerodynamic force on the control surface is transferred, and attitude control moment of the unmanned aerial vehicle is provided. The screw propellers and linked control surfaces in the left control surface assembly and the right control surface assembly work together, so that complicated attitude adjustment of the unmanned aerial vehicle in the flight process is ensured, the attitude control mechanism has flexible operating performance, and smooth flight safety performance of the unmanned aerial vehicle is achieved.