The invention relates to the technical field of board role-playing game auxiliary equipment, in particular to an augmented reality physical digital board role-playing game auxiliary extension system, comprising a chessboard frame provided with a chessboard; smart phone stands are arranged outside two sides of the chessboard frame respectively, each smart phone stand is provided with a smart phone retaining position, and an integrated periscope is mounted on each smart phone retaining position; luminous bands or light guide plates are arranged at the periphery of an inner bottom plate of the chessboard frame, and a smart phone and tablet personal computer retaining position is arranged at the center of the chessboard frame and is provided with a fisheye lens; the augmented reality physical digital board role-playing game auxiliary extension system is simple in structure; the chessboard design is friendly to the traditional board role-playing game manner and free of memorizing a large quantity of game methods and recording game processes; the use of the newly-developed augmented reality extension technology allows a large quantity of objects to be recognized at the same time under large area and solves the lens blocking problem; chessmen and cards are uniquely recognized by using special image signs, and pirated chessmen are avoided.