The present invention provides a flexible screen being able to switch between a flat shape and a curved shape and TV set thereof, comprising: a flexible screen and a power mechanism arranged on one side of the flexible screen, applied to driving the flexible screen to switch between a flat shape and a curved shape; the power mechanism comprises: a telescoping arm and a telescoping power unit arranged on the telescoping arm and applied to driving the telescoping arm elongating and contracting following the horizontal direction. The user may adjust the curved or flat state of the flexible screen through a remote control of the remoter or through a manual adjustment of the ring handle: when a view effect of the curved screen is wanted, through pressing the button for curved screen in the remoter or through rotating the ring handle, switching the flexible screen from flat to curved, and a good view effect is achieved; or through pressing the button for flat screen in the remoter or through rotating the ring handle, switching the flexible screen from curved to flat, to satisfying the view of a plurality of viewers.