The utility model discloses a Newton's cradle-shaped timer. The Newton's cradle-shaped timer comprises a steel frame, a dial, a timer body, hanging ropes and small balls. The hanging ropes, five in number, are located at the center of the steel frame. The small balls are connected at the lower portions of the hanging ropes. The timer is located above the hanging ropes. The dial is located behind the hanging ropes. The overall timer is in the axisymmetric distributed structure. The small balls are metal balls with the same size and quality. A sensor is arranged among the dial and the hanging ropes. The dial is engraved by words including 5 min, 10 min and 15 min. The words including 5 min, 10 min and 15 min are the time marked for swinging one ball. The Newton's cradle-shaped timer has following beneficial effects: timing can be carried out at any time and any placed; without a watch or with an uncharged mobile phone, time can be conveniently known; and the Newton's cradle-shaped timer is convenient and practical.