The invention discloses a system used for vibration reduction and capable of changing the structural rigidity. The system is divided into three main parts including a control part, a current transmission part and a magnetic current sheet body, wherein the control part comprises a vibration sensor, a control unit, a relay, a power supply and a fuse, the current transmission part comprises a power supply, a fuse, a relay corresponding switch and an electromagnetic rod, the magnetic current sheet body comprises magnetic conductive rubber and magnetorheological fluid arranged in the magnetic conductive rubber layer, the magnetic current sheet body is mounted and positioned on a tower drum through a mounting rack and an auxiliary mounting rack, and the electromagnetic rod is composed of an ironsheet, a metal spring and a wire and is transversely wound outside the magnetic current sheet body. When the electromagnetic rod is electrified, the electromagnetic rod discharges a magnetic field, the rigidity of the magnetic current sheet body is increased under the action of the magnetic field, and the solid property is shown; and the rigidity of the whole structure can be increased accordingto needs, and the change is rapid and reversible. According to the system, the magnetic field can be added by electrifying the system, so that the structural rigidity is improved, and the vibration and resonance problems are effectively solved.