The embodiment of the invention provides a cover plate, a preparation method of the cover plate and a display device thereof and relates to the technical field of touch control. The use frequency of composition process can be reduced and the bridge point breakdown phenomenon in ESD process can be avoided. The cover plate comprises a transparent substrate, an induction electrode layer and a driving electrode layer which are arranged on the transparent substrate, wherein the induction electrode layer and the driving electrode layer are isolated by an insulating layer; the induction electrode layer comprises a plurality of induction electrodes; the driving electrode layer comprises a plurality of driving electrodes; the induction electrodes and the driving electrodes are arranged in a crossing form; the induction electrodes and the driving electrodes have grid structures. The cover plate is applied to a touch display device.