The utility model provides a glass granule crushing device, namely an inertia force determining machine which is used for acquiring glass granules, is continuous, stable and controllable in integral process, realizes the intelligent operation and meets the requirement on standardized quantification. The glass granule crushing device comprises a stand, a lifting mechanism, a magnetic mechanism, a heavy hammer mechanism and a crushing mechanism, wherein the stand is used for supporting the integral device; the lifting mechanism is arranged on the stand and controlled by a driving mechanism; the magnetic mechanism comprises an electromagnet, is connected with the lifting mechanism and can lift along a guide mechanism under the driving of the lifting mechanism; the heavy hammer mechanism comprises a heavy hammer and is arranged below the magnetic mechanism; the crushing mechanism comprises a pestle and a grinding body; the pestle is positioned below the heavy hammer mechanism; the grinding body is positioned on the stand. According to the glass granule crushing device, when the electromagnet is switched on, the electromagnet can be attracted with the heavy hammer mechanism; when the electromagnet is switched off, the heavy hammer mechanism can fall to impact the pestle.