A belt exercising and massaging device includes a cushion, and a massaging belt unit mounted on the cushion and including two massaging belts each extending from a surface of the cushion and each movable relative to the cushion. Thus, the massaging belt unit is operated to drive the massaging belts to move and swing rightward and leftward so as to provide a massaging effect to a user. In addition, the massaging belts surround the user's body in a planar manner so that the force applied by the massaging belts is distributed on the user's body smoothly and evenly without producing an excessive vibration and a stress concentration, thereby providing a comfortable sensation to the user, and thereby preventing the user's body from being hurt.