Device for preparing oxygen through catalytic decomposition of hydrogen peroxide via manganese dioxide

The utility model discloses a device for preparing oxygen through the catalytic decomposition of hydrogen peroxide via manganese dioxide, and the device comprises a support platform. A spherical tunnel is fixed on an upper iron ring of the support platform, and an upper conduit of the spherical tunnel stretches into a gas collection bottle which is buckled in a water tank reversely. A lower mouth of the spherical tunnel is connected with two conduits, wherein one conduit stretches into and is fixed into a lower mouth of a hydrogen peroxide container of a lower iron ring of the support platform, and the other conduit is provided with a water stopping clamp and stretches into a water container. The upper part of the hydrogen peroxide container is opened. The water stopping clamp of the long neck tunnel can be opened at any time in a test, so as to discharge waste liquid, thereby guaranteeing that the concentration of hydrogen peroxide is not high excessively, and saving time for the quicker preparation of a bottle of oxygen. A small segment of the conduit, which is connected with a beverage bottle and stretches into the long neck tunnel, comes out from a liquid surface, thereby preventing a part of waste liquid from flowing into the conduit connected with the beverage bottle when the water stopping clamp is opened for the discharging of waste liquid. Hydrogen dioxide solution with lower concentration also can be used for the quicker preparation of oxygen, thereby saving medicine.