Laboratory liquid stirrer

The utility model relates to a laboratory liquid stirrer, which belongs to the technical field of laboratory stirring tools and comprises a cap-shaped head, a ball screw, a spring, a sleeve, a ball nut, a stirring rod and a stirring head. A bearing is welded on the inner wall of the cap-shaped head; the inner wall of the bearing is welded with the outer surface of the top end of the ball screw; the outer surface of the ball nut is fixed with the inner wall of the sleeve, the ball screw is matched with the ball nut, the spring is sleeved on the ball screw between the cap-shaped head and the sleeve, the upper end of the spring is fixed with the cap-shaped head, and the lower end of the spring is fixed with the sleeve; the lower end of the ball screw is detachably connected with a stirring rod through a connector, and the lower end of the stirring rod is provided with a stirring head. The stirring device can stir in the vertical direction, cannot collide with the inner wall of a container, is not easy to damage,