Display module, preparation method thereof and display device

The invention provides a display module, a preparation method thereof and a display device, belongs to the technical field of display, and can solve the problems that a groove preparation process of a back film layer in an existing display module is relatively complex and relatively low in precision. And problems are solved. The preparation method of the display module comprises the steps that a first release layer on one side of a back film layer is stripped, and a second release layer on the other side of the back film layer is reserved; the back film layer is attached to the display panel; the display panel is provided with a bending area and non-bending areas, and the bending area is located between the adjacent non-bending areas. The non-bending area part corresponding to the back film layer is processed, so that the bonding force of the non-bending area part corresponding to the back film layer is larger than that of the bending area part corresponding to the back film layer; and stripping the parts, co