The utility model discloses a horizontal hydrophobic flash vessel, include the jar body of the cylinder type of horizontal installation, hydrophobic return bend is connected with a jar body right -hand member terminal surface, be equipped with hydrophobic import on the hydrophobic return bend, the steam drain is located jar a body top, the delivery port be located jar body bottom and delivery port extend to jar internal jar body inside of the top of hangs and installs a spray header, its characterized in that: the sluicing groove of a U type and hydrophobic energy current to the sluicing inslot of being added by hydrophobic return bend are installed to the jar body overhang, it is progressively downward to the left end from the right -hand member in sluicing groove that the tank bottom in sluicing groove is step form and step. The utility model provides a horizontal hydrophobic flash vessel has simple structure, and multistage supplementary hydrophobic cooling is stepped down, reduces double -phase impact to equipment, reduces calorific loss simultaneously.