The invention discloses a separated cylindrical stabilizer based on the Magnus effect, and belongs to the field of ship stabilization. The separated cylindrical stabilizer comprises a motor, a motor bearing, a universal joint, a linear bearing, two semi-cylinders and an end plate, one ends of the two semi-cylinders are connected together through the end plate, one end of the motor is connected with one end of the motor bearing, and the other end of the motor bearing is connected with one end of the universal joint; one end of the universal joint is connected with one end of the linear bearing,the other end of the linear bearing is connected with one ends of the semi-cylinders, and the motor rotates to drive the semi-cylinders to rotate. According to the invention, the motor drives the twosemi-cylinders to rotate, the two semi-cylinders rotate to enable the stabilizer to generate the pressure difference, so that the lift force is generated. The stabilizers are installed at the two sides of a ship respectively, the generated torque can offset the rolling torque of the ship, so that the stabilizing effect is achieved. A certain gap is formed between the two semi-cylinders, so that ashunt effect can be achieved, the resistance is reduced, the lift-drag ratio is increased, and the stabilizing effect can be improved.