Magnetic stirring device and bioreactor

The utility model provides a magnetic stirring device and a bioreactor, the magnetic stirring device comprises a base, a stirring paddle component and an electromagnetic driving mechanism, a cavity with an opening at the top is formed in the base, the stirring paddle component comprises a paddle and a paddle base, the paddle base is rotatably mounted in the cavity, and the electromagnetic driving mechanism is arranged in the cavity. The paddle base comprises a shell and a magnetic part arranged in the shell, the paddle is arranged at the top of the shell, the electromagnetic driving mechanism interacts with the magnetic part to drive the paddle base to rotate in the cavity, a protruding part is arranged between the inner wall of the cavity and the shell, and the protruding part is located on the inner wall of the cavity and is adjacent to the outer wall of the shell; or the protruding part is located on the outer wall of the shell and is adjacent to the base, and the cavity and the paddle base are coaxially a