The utility model discloses a nozzle automatically regulated flow device, including the fixed case of oil gun, tanker aircraft oil gun, adjusting and control device, the tanker aircraft oil gun sets up in the fixed incasement portion of oil gun to make a round trip to stir the oil gun trigger of tanker aircraft oil gun through step motor, realize opening and closing of oil gun trigger, examination big or middle to the tanker aircraft oil gun, the low discharge is realized through the ARM treater to fuel tanker aircraft examination in -process, and the LCD interface and the touch -sensitive screen of ARM treater pass through the data line and link to each other, be arranged in respectively selecting big, little range, the GPIO pin of ARM treater and step motor driver, triangle electromagnetic?valves are continuous, are used for controlling step motor and oiling flow dimension respectively. But the device substitute holds the tanker aircraft oil gun, does not need the manual work to pull the oil gun trigger and adjusts, avoid oil volatilize to the examination personnel the health cause the injury, improved the accuracy of injection flow, can exert great effect in the examination field of fuel tanker aircraft.