The invention relates to a fist striking force-metering device, comprising a support vertically fixed on the ground and a sliding cylinder horizontally fixed on the support; one end of the sliding cylinder is provided with a push rod which can extend into the sliding cylinder; a spring is wound on the push rod in a sleeving manner, the outer diameter of the spring is equal to that of the sliding cylinder; a striking board is arranged on one end, outside the sliding cylinder, of the push rod; a small ball is put on the other end of the sliding cylinder, and a colored ribbon is fixed to the small ball; the center of the small ball and the center of the striking board are located on the axial lead of the push rod; a small hole is formed in the side wall of the other end of the sliding cylinder, and the colored ribbon passes through the small hole and winds on a wire spool fixed outside the sliding cylinder; the colored ribbon is divided into various lengths from a fixed end of the small ball to a fixed end of the wire spool, and all lengths are respectively coated with different colors. According to the device provided by the invention, the magnitude range of the striking force can be obtained according to the color of the colored ribbon at the opening of the sliding cylinder when the small ball falls to the ground, so that the force metering is convenient and visual; in addition, when the small ball is struck out, the colored ribbon is driven out just like a rainbow, so the ornamental value is extremely high.