Flexible display panel and preparation method thereof, display device and display module

The invention relates to the technical field of display, and provides a flexible display panel and a preparation method thereof, a display device and a display module. The flexible display panel comprises a plane area, a first bending area, a second bending area and a corner bending area, the first bending area is connected to the first edge of the plane area in the first direction, the second bending area is connected to the second edge of the plane area in the second direction, and a set angle is formed between the second direction and the first direction; a corner bending area is connectedto the corner of the plane area; a corner bending area is arranged on the base and connected between the first bending area and the second bending area, the corner bending area is provided with a plurality of first hole sets, after the corner bending area is bent, the width of the first hole set located in the middle of the corner bending area is increased, and the width of the first hole set located in the edge area of the corner bending area is decreased. Tensile strain and compressive strain are absorbed through the first hole set, and attaching cracks and edge area wrinkles of the flexibledisplay panel are reduced. No bubbles can be generated.