The invention belongs to the technical field of fine chemical engineering, and relates to a continuous vacuum degassing process for chlorinated paraffin and a device thereof. A semi-finished chlorinated paraffin product is subjected to degassing refining through two degassing towers, namely, after the flow rate of the semi-finished chlorinated paraffin product is controlled by an automatic regulating valve, the semi-finished chlorinated paraffin product is sprayed out from the upper middle part of the main degassing tower, and under the action of vacuum, a large amount of chlorine and hydrogen chloride gas are egressed; after egressed chlorinated paraffin is pressurized by a circulating pump, one part of the chlorinated paraffin is fed into the upper part of the main degassing tower to carry out spray degassing, the other part of the chlorinated paraffin, after subjected to automatic flow-rate adjustment control, is fed into an assistant degassing tower, and through carrying out chlorine and hydrogen chloride gas egressing for twice, another part of the chlorinated paraffin, after subjected to flow-rate control through the automatic regulating valve, is fed into a finished product storage tank. According to the invention, the whole technological process is completely and automatically controlled, simple and convenient to operate, and large in treatment quantity. Compared with other processes, the process disclosed by the invention is low in energy consumption, the staying time of chlorine and hydrogen chloride gas in chlorinated paraffin is short; chlorinated paraffin is not in contact with other process mediums, so that the product quality can be improved; and a stabilizer is automatically added, so that an effect of safety and environmental friendliness is achieved.