The present invention discloses a method and device capable of measuring the volume of gases produced by elements of a metallized film capacitor in an actual motion condition. The method provided by the invention is capable of simulating the condition of gas production when a short circuit breakthrough fault of a capacitor happens, and at the same time the gases generated in the operation process of the capacitor are all collected into a measuring cylinder, then the volume of the gas production is measured by scales on the measuring cylinder. According to the method, the volume of gas production in the process of the breakthrough short circuit fault of the elements of the metallized film capacitor may be measured, and at the same time the gases may be collected to perform a component analysis of gas production. The present invention further provides a device and materials for implementing the method, wherein the device mainly comprises an insulated container, a rubber hose, a glass measuring cylinder and insulating oil. The materials and the devices used in the invention all have good insulating properties so that the safety of the experimental process may be ensured.