Single-tower rectification method and system capable of continuously separating hydrogen isotope in water

The invention discloses a single-tower rectification method and system capable of continuously separating hydrogen isotopes in water, and relates to the technical field of hydrogen isotope rectification, and the single-tower rectification system adopted by the method comprises a rectification tower, a total condenser and a reboiler; the method specifically comprises the following steps: arranging a feeding hole according to a height ratio of 0-180 of a rectifying section to a stripping section, and vacuumizing the inside of a rectifying tower to a preset vacuum degree; starting the total condenser and the reboiler, introducing raw material water from a feed port to perform total reflux of the rectifying tower, raising the temperature in the rectifying tower to 20-40 DEG C, setting the reflux ratio of the total condenser to be 0.5-30, and setting the total reflux time to be 3-24 hours; and recovering deuterium-depleted water from the tower top, and recovering deuterium-rich water from the tower kettle. The deu