Full-automatic liquid-liquid extraction instrument

The invention provides a full-automatic liquid-liquid extraction instrument. The full-automatic liquid-liquid extraction instrument comprises a sample disc driven by a stepping motor to rotate; a circle of water sample placing positions for placing water sample cups and a circle of concentration pipe placing positions for fixing concentration pipes are distributed on the circumference of the sample disc; a liftable mechanical arm and a swingable rotating arm are arranged on the side edges of the sample disc; a stirring rod, a liquid suction pipe and an injection pipe are mounted on the mechanical arm; the mechanical arm drives the stirring rod, the liquid suction pipe and the injection pipe to lift relative to the water sample cups below; a liquid discharge nozzle is arranged at the free end of the rotating arm; a waste liquid tank is arranged on one side of the sample disc; and the liquid discharge nozzle is driven by the rotating arm to be switched to move back and forth above the waste liquid tank and the