The utility model discloses a desalting flash tank containing easily soluble monovalent salt ethylene glycol. The desalting flash tank mainly comprises a desalted water inlet, a stoste inlet, a flash outlet, overheat atomizing nozzles, an overheat circulating inlet, stainless steel filler, a circulating heating outlet, an isolated settling cone, a bottom solid-liquid whirlcone, a supersaturated salt water outlet and a desalting flash tank housing. The desalting flash tank is characterized in that the desalting flash tank, the stoste inlet, the overheat circulating inlet, the filler, the isolated cone, the desalted water inlet, and the bottom whirlcone are orderly arranged from top to bottom; the desalted water inlet tangentially enters the tank in the middle of the isolated cone and the bottom whirlcone; the overheat atomizing nozzles are evenly arranged on a pipeline of the overheat circulating inlet inside the desalting flash tank; the taper angle alpha of the isolated cone and the taper angle beta of the bottom whirlcone are 15-45 DEG C, wherein alpha is greater than or equal to beta; the desalting flash tank is divided into an upper part and a lower part by the isolated cone; and the bottom whirlcone is arranged at the lower part. The practice shows that the desalting flash tank is small in volume, simple in structure, low in energy consumption, and high in desalting efficiency.