The invention discloses a touch screen panel, a preparation method thereof, and a display device, and relates to the field of display. According to the touch screen panel, the method and the device, flexible touch can be realized, and moreover, the problem that a flexible substrate is relatively flexible and is difficult to operate when the flexible substrate is prepared is solved. The preparation method of the touch screen panel comprises the steps of depositing an auxiliary film layer on a first substrate, wherein the material of the auxiliary film layer comprises a graphene catalyst required for preparing graphene; etching a touch graph on the auxiliary film layer through a graph composition technology; preparing a graphene film layer on the auxiliary film layer on which the touch graph is etched, wherein the formed graphene film layer has a graph consistent with the touch graph of the auxiliary film layer; forming flexible base film on the graphene film layer; and removing the first substrate and the auxiliary film layer.