An embodiment of the invention discloses an arc chute scale. The arc chute scale comprises an oblique guide chute, wherein a feed hopper is arranged above the guide chute, an arc weighing chute is arranged at the end of the guide chute, a gap is reserved between the guide chute and the arc weighing chute, a first force measurement sensor and a second force measurement sensor are arranged at the bottom of the arc weighting chute, the arc weighing chute is installed at the force measurement end of the first force measurement sensor, a fixed end of the first force measurement sensor is installedat the force measurement end of the second force measurement sensor, a fixed end of the second force measurement sensor is installed on a rack, and both the first force measurement sensor and the second force measurement sensor are electrically connected with a weighing meter. The invention also discloses a weighing method. Material flow and accumulated weight can be calculated and displayed automatically by combining programming calculation and using a simple, reliable and steady arc chute structure, so that the arc chute scale is particularly suitable for flow measurement and continuous accumulated weighing of various bulk materials and liquids.