Flexible display substrate, manufacturing method thereof, and flexible display device

A manufacturing method of a flexible display substrate, comprising:

• forming a plurality of protrusions on a base substrate;
• forming a base film at one side of the plurality of protrusions facing away from the base substrate, so that a plurality of concaves is formed by the plurality of protrusions at one side of the base film facing to the base substrate;
• forming a display structure at a surface of the base film facing away from the base substrate;
• peeling off the base film along with the display structure from the base substrate, and remaining the plurality of protrusions on the base substrate;
• and
• attaching the surface of the base film facing away from the display structure onto an elastic substrate and stretching the elastic substrate so that the base film is fractured at positions of the plurality of concaves,
• wherein the plurality of protrusions are arranged in an array and comprise multiple first protrusions and multiple second protrusions;
• the multiple first fracture protrusions are arranged alternately with the multiple second protrusions;
• an extending direction of a length of the first protrusion is perpendicular to an extending direction of a length of the second protrusion;
• and
• the first fracture protrusion and the second protrusion both have a strip structure.