A tilt driving mechanism comprises a housing fixedly mounted on the aircraft, a driving mechanism mounted in the housing, and a mounting seat flexibly mounted on the housing. A power unit is fixedly mounted on the mounting seat, and the driving mechanism is fixedly connected to the mounting seat, so as to drive the mounting seat to rotate with respect to the housing. The tilt driving mechanism is disposed on the aircraft, and a rotation angle of the tilt driving mechanism is controlled with high precision to change a direction of the power unit, so that the power unit switches between a lift force providing position and a thrust providing position. Meanwhile, the driving mechanism is disposed in the tilt driving mechanism, thereby significantly reducing a torque of the driving mechanism, facilitating miniaturization design of the tilt driving mechanism, and improving stability and safety of the tilt driving mechanism.