NOVELTY - A 7N electronic level hyperpure ammonia is extracted by feeding industrial liquid ammonia into primary rectifying and purifying tower through liquid difference of feeding tank and primary rectifying and purifying tower; and keeping pressure at 0-1.6 MPa, and automatically feeding the material in the condition that the liquid phase port of the high level feeding tank is 100 cm greater than the primary rectifying and purifying tower kettle.    USE - Method for extracting 7N electronic level hyperpure ammonia (claimed), used for liquid crystal display, organic light emitting display and semiconductor light emitting diode and other photoelectrons and solar energy battery photovoltaic device.    ADVANTAGE - The method can produce high pure ammonia whose content is greater than 99.9995% through primary gasifying and rectifying method; hyperpure ammonia whose content is greater than 99.99994% through secondary rectifying and purifying method; and 7N electronic level hyperpure ammonia whose content is greater than 99.99999% through third deep rectifying and purifying method.    DETAILED DESCRIPTION - Extracting 7N electronic level hyperpure ammonia via rectifying and separating method, comprises:    (A) feeding industrial liquid ammonia into primary rectifying and purifying tower through liquid difference of feeding tank and primary rectifying and purifying tower; and keeping pressure at 0-1.6 MPa, and automatically feeding the material in the condition that the liquid phase port of the high level feeding tank is 100 cm greater than the primary rectifying and purifying tower kettle;    (B) keeping the temperature of the top and kettle of the primary rectifying and purifying tower at 0-40 degrees C, keeping the pressure at 0.5-1.5 MPa, keeping the temperature of the cooling water at - 5-30 degrees C and keeping the ratio of evacuation and backflow quantity of light components on the tower top at 1:30-100; keeping the ratio of the fed quantity and the evacuation of the tower top at 1:50-100; and rectifying and separating under conditions to reduce the contents of the light components, heavy components, water content and metal ion of the raw material and obtain high pure ammonia product whose content is greater than 99.9995% from the outlet on the upper part of the rectifying and purifying tower;    (C) leading high pure ammonia into secondary rectifying and purifying tower, keeping temperature of the top and kettle of the primary rectifying and purifying tower at 0-40 degrees C, keeping the pressure at 0.5-1.5 MPa, keeping temperature of the cooling water at - 5-30 degrees C and keeping the ratio of the evacuation and backflow quantity of the light components on the tower top at 1:30-100, keeping the ratio of the fed quantity and the evacuation of the tower top at 1:50-100, and rectifying and separating under conditions to reduce the contents of the light components, heavy components, water content and metal ion of the raw material and obtain the hyperpure ammonia product whose content is greater than 99.99994% from the outlet on the upper part of the rectifying and purifying tower; and    (D) leading hyperpure ammonia product into third rectifying and purifying tower, keeping the temperature of the top and kettle of the primary rectifying and purifying tower at 0-40 degrees C, keeping the pressure at 0.5-1.5 MPa, keeping the temperature of the cooling water at - 5-30 degrees C and keeping the ratio of the evacuation and backflow quantity of the light components on the tower top at 1:30-100, keeping the ratio of the fed quantity and the evacuation of the tower top at 1:50-100, rectifying and separating under conditions to reduce the contents of the light components, heavy components, water content and metal ion of the raw material and obtain the high pure ammonia product whose content is greater than 99.99999% from the outlet on the upper part of the rectifying and purifying tower.