The invention discloses a display panel, a control method thereof and a display device and belongs to the technical field of display. The display panel comprises a first substrate and a second substrate which are opposite to each other. A plurality of pixel units are arranged between the first substrate and the second substrate. Each pixel unit comprises a common electrode arranged on the surface, close to the second substrate, of the first substrate and a movable electrode arranged on the surface, close to the first substrate, of the second substrate, wherein the common electrode and the movable electrode are made of transparent reflective materials, and the common electrode and the movable electrode form an optical resonant cavity; when voltage is loaded onto the common electrode and the movable electrode, the movable electrode can move close to or away from the common electrode so as to change the interval between the movable electrode and the common electrode and the area of a region on the movable electrode, and the interval between the region and the common electrode is the preset interval. By the arrangement, the light utilization rate of the display panel is increased. The display panel is applicable to the display device.