Adjustable precise continuous injector and use method thereof

The invention discloses an adjustable precise continuous injector. The adjustable precise continuous injector comprises needle cylinders, a needle bed, an injection arm and an injection piston, and is characterized in that the needle cylinders comprise a first needle cylinder and a second needle cylinder, a liquid absorbing arm is arranged in the first needle cylinder, the top end of the liquid absorbing arm is connected with a liquid absorbing pull plate, the bottom end of the liquid absorbing arm is connected with the injection piston, the liquid absorbing arm is a ladder-shaped piston arm, a control device is arranged outside the second needle cylinder, the injection arm is arranged inside the second needle cylinder, the upper end of the injection arm is connected with an injection pressing plate, quantifying threads are arranged on the injection arm, the injection arm is connected with a second power device, a locator is further arranged in the second needle cylinder, one end of the locator is connected w