The invention discloses a flexible display device, a flexible display panel and a driving method thereof. The flexible display panel comprises a flexible substrate, and a plurality of data lines, at least one pressure sensing unit, a data driving circuit and a pressure driving circuit which are arranged on the flexible substrate, wherein the pressure sensing unit is composed of four resistance strips which are connected in a Wheatstone bridge manner; a first output end and a second output end of the pressure sensing unit are connected with the pressure driving circuit through reutilizing the two data lines, and/or a first input end and a second input end are connected with the pressure driving circuit through reutilizing the two data lines; the pressure sensing unit is connected with the pressure driving circuit through reutilizing the two data lines at least, so that a few of or no pressure signal lines are introduced on the basis of integrating a pressure induction function in the flexible display panel, and the aim of simplifying the arrangement of a line in the flexible display panel is realized.