The invention provides a touch display panel, a manufacturing method thereof and a touch display device. The touch display panel comprises a first substrate, a second substrate, a nano metal grating, an organic light emitting layer and a phase difference piece, wherein the first substrate and the second substrate are arranged oppositely, the nano metal grating is located at the position, away from or close to one side of the second substrate, of the first substrate, the organic light emitting layer is located at the position, close to one side of the first substrate, of the second substrate, and the phase difference piece is located between the nano metal grating and the phase difference piece; a round polaroid is formed by the phase difference piece and the nano metal grating, and the nano metal grating is divided into at least one grating unit communicated mutually to form a touch sensor. The purpose of integrating the round polaroid and the touch sensor is achieved, the thickness of the displayer is reduced, manufacturing cost is reduced, and adverse factors caused by polaroid can be avoided, for example, the polaroid is prone to being affected with damp.