The invention relates to the technical field of produced liquid treatment in oil field central treatment stations, and relates to a rapid dehydration method for a low-temperature sealed interface of aproduced liquid in an oil field central treatment station and a device for implementing the method. The method is characterized in that after an oil phase, a gas phase and a water phase in the produced liquid are separated by adopting a three-phase separator, after water-containing crude oil is heated to a dehydration temperature by a steam phase change heating furnace, rapid dehydration is performed in a fast closed dehydrator, and therefore settling separation of the crude oil is realized; and the device is characterized by comprising the three-phase separator, the steam phase change heating furnace, the interface fast closed dehydrator and an oil-water sedimentation separator. According to the process provided by the invention, the device is simple and convenient, an oil-water interface film is rapidly broken by the interface fast closed dehydrator, oil beads are aggregated, water beads are coalesced, oil transaction indexes of rapid oil-water separation and a water content of lessthan 0.5% are achieved, so that the purposes of a reduced dehydration temperature, a reduced concentration of an added demulsifying agent, and shortened dehydration time are realized; and associatedgases are not discharged to the outside, so that the method and the device have significant environmentally-friendly, social and economic benefits.