The invention discloses a full-temperature-range pressure-swing adsorption method for dehydrating vinyl chloride and relates to the technical field of dehydration treatment of the vinyl chloride. The full-temperature-range pressure-swing adsorption method comprises a pretreatment working procedure, an adsorption concentration working procedure and a recycling working procedure. The specific steps are as follows: the pretreatment working procedure: adopting one-time solid adsorption, and adsorbing oil stain, heavy molecular gas, a small amount of water and the like in raw material gas by an absorbent; feeding relatively-pure vinyl chloride subjected to pretreatment and impurity removal into the adsorption concentration working procedure, wherein the adsorption pressure is 0.5 to 2.5 Mpa, and the operation temperature is 60 to 150 DEG C; outputting pure vinyl chloride from the top of an adsorption tower, pumping out and desorbing water which is not adsorbed by a vacuum pump, and keeping the vacuum degree of a vinyl chloride dehydrating tower at -0.088 Mpa to -0.094 Mpa; cooling exhausted low-concentration vinyl chloride gas to a low-concentration vinyl chloride solution and then storing the low-concentration vinyl chloride solution; carrying out heat exchange on the low-concentration vinyl chloride solution and the low-concentration vinyl chloride gas to obtain a medium-temperature vinyl chloride solution; feeding the obtained medium-temperature vinyl chloride solution into a rectifying column for refining through a circulating liquid pump, and recycling the refined liquid.