The invention discloses a low-energy consumption low-loss vinyl chloride rectifying technology. The technology comprises the steps that 1, two stages of condensation liquefying is performed on most crude vinyl chloride gas through circulating water and chilled water respectively, and liquid enters a first water separator to be pumped to the upper middle portion of a low boiling tower for feeding; 2, uncondensed gas enters a tail gas condenser for deep condensation, condensate enters a second water separator and self flows to the upper portion of the low boiling tower to be charged, and non-condensable gas is delivered to a tail gas treatment device; 3, the tower top gas of the low boiling tower returns to a conversion unit, and crude vinyl chloride liquid at the tower bottom enters a high boiling tower; 4, a vinyl chloride product is obtained on the top of the high boiling tower, and high boiling residues generated at the tower bottom is delivered to a residue treatment device. The technology has the advantages that due to the fact that oxygen in the light components is effectively removed by adopting two stages of condensation, the tower top gas of the lower boiling tower can be circulated to the front-end conversion unit to be directly reused, material circulation is reduced, and material and energy consumption is reduced; the amount of water entering a rectifying tower can be effectively decreased, and the self-polymerization degree of the vinyl chloride in the rectifying tower is reduced; the rectifying efficiency is improved, the yield is increased, and the huge economic and environment-friendly value is achieved.