Independent suspension vibration reducing device of middle and rear wheels of automobile

The invention provides an independent suspension vibration reducing device of middle and rear wheels of an automobile. The independent suspension vibration reducing device comprises two suspension vibration reducing devices which are symmetrically arranged left and right. The two suspension vibration reducing devices share a torsion rod spring adjusting permanent seat; each of the suspension vibration reducing devices comprises a bearing beam, a strength bearing arm, a torsion rod spring and an axle tube, wherein the axle tube and a back cross beam of an automobile chassis are fixed integrally, and one end of the strength bearing arm sleeves the axle tube while the other end of the strength bearing arm can be rotatably connected to a support lug in the middle portion of the bearing beam; two ends of each bearing beam are mounting ends connected to housings of the middle and rear wheels, and the bearing beam and the housings of the middle and rear wheels are fixed as a rigid body during mounting; and the outer