Device and method used for observing combustion of aerospace equipment under weightlessness state

The invention discloses a device and a method used for observing the combustion of aerospace equipment under a weightlessness state, and belongs to the field of weightlessness state research. The device comprises a guide rail, wherein the guide rail extends to a lower point from a high point; in addition, the rail has a radian which is downwards bent in an extension process; in a process that an experiment vehicle moves to the lower point from the high point of the rail, the experiment vehicle slides down along the rail, and the experiment vehicle is under the weightlessness state when the experiment vehicle is positioned on any position of the rail in a process of sliding down; and a cavity is arranged in the experiment vehicle, a combustion chamber is arranged in the cavity, a combustionobject which is fixedly placed is arranged in the combustion chamber, the side wall, which is positioned in the cavity, of the combustion chamber is provided with high-temperature-resistant glass, and a photographing device