Dehydrated demulsifier of crude oil extraction from thick oil pool

The invention relates to a kind of dehydrator and emulsion-breaker as well as its preparing method. The characteristic of the invention includes: preparing two kinds of surface active agent; putting the active agents, N-ethyl perfluoro-octyl sulfamine polyoxyethylene ether into the reactor by turns, reacting at a certain temperature for some time to get a dry agent; putt the dry agent into the mixing caldron and dropping water into the caldron slowly to get the dehydrator and emulsion-breaker, the demulsificating and dehydrating effect is better than the present emulsion-breaker. The dehydrating process uses less dehydrator and emulsion-breaker; after the process, the water content of the crude oil is less than 0.2% which can fulfill the water content request; the oil content in the waste liquid has decreased from 20% to less than 50mg/l.