Underwater ejection experiment device for multi-scale-ratio experiment

The invention provides an underwater ejection experiment device for a multi-scale-ratio experiment, and belongs to the field of underwater ejection experiments. The problems that an experimental device cannot carry out multi-scale-ratio experiments, and the first-level precision and repeatability cannot be guaranteed are solved. The device comprises a base, a plurality of mounting holes are formed in the base, and each mounting hole is used for mounting experiment modules with different scale ratios; the experiment module comprises a gas conveying module which is connected with the mounting hole at the corresponding position; the high-pressure gas cylinder module is connected with the inlet end of the gas conveying module; the launching cylinder module is connected with the outlet end of the gas conveying module and used for receiving the high-pressure gas output by the high-pressure gas cylinder module to launch the projectile body; the launching cylinder module comprises a launching cylinder, a sealing ring