Wind-driven energy converting device

A wind-driven energy converting device comprising a main pendulum comprising a pendulum bob attached to a pendulum rod, wherein a sail member is attached to the pendulum rod of the main pendulum in a higher position than the pendulum bob of the main pendulum, wherein the main pendulum is suspended in a frame by a bearing unit, wherein the bearing unit comprises two pivots, each one of the two pivots extending along one of two perpendicular horizontal axes (X, Y) and allowing the pendulum rod to swing about the two perpendicular horizontal axes (X, Y) at the same time, wherein the main pendulum is mechanically attached to at least one secondary pendulum by a connection structure, wherein the at least one secondary pendulum is connected to a driving shaft, and the motion of the main pendulum causes the at least one secondary pendulum to move, which causes the driving shaft to rotate.