The application provides a display panel and a control method thereof and a display device. The display panel includes a control module, a display substrate and an adjustment device arranged on the light output side of the display substrate. The adjustment device includes a first electrode, a first insulating layer, an electrostrictive layer and a second electrode, which are stacked together. Thecontrol module is connected with the first electrode and the second electrode, and is used for controlling the voltages of the first electrode and the second electrode and adjusting the electric fieldgenerated between the first electrode and the second electrode so as to deform the electrostrictive layer under the action of the electric field and adjust the propagation direction of light incidenton the electrostrictive layer. The adjustment device is arranged on the light output side of the display substrate. The electrostrictive layer in the adjustment device is deformed to form a lens structure under the action of the electric field, so as to change the propagation direction of incident light and the size of visual angle of display. Thus, the display panel achieves an anti-peep (reducing the angle of view) or sharing (increasing the angle of view) effect.