The invention provides a touch display panel and a preparation method thereof as well as a display device. The touch display panel comprises a touch panel and a display panel which are sequentially arranged from top to bottom; a projection of the touch panel on the display panel is positioned in the display panel; the touch display panel further comprises an edge protective layer which encircles the touch panel and is used for refracting light of the edge protective layer to realize a purpose of no frame. The touch display panel has the advantages that the breaking possibility of a display screen can be lowered, a relatively small thickness and a relatively light weight can be realized, and meanwhile, the touch sensitivity and the response speed can be higher.