Device and method for preparing deuterium

The embodiment of the invention discloses a device for preparing deuterium. The device comprises an electric cathode container cylinder, a diaphragm, an electric anode and an activation source, wherein the electric cathode container cylinder is used for switching on a negative electrode of a power supply; the diaphragm is disposed in the electric cathode container cylinder and used for forming ananode region inner cavity and a cathode region inner cavity; the electric anode is used for switching on a positive electrode of the power supply and is disposed in the anode region inner cavity of the diaphragm; the activation source is used for activating the activity of a D-O chemical bond in an aqueous solution. The embodiment of the invention further discloses a method for preparing deuterium. By adopting the device for preparing deuterium disclosed by the embodiment of the invention, after an aqueous solution is introduced along a water inlet, the activation source can be input into thecathode region inner cavit