The invention provides an abnormal-noise prevention structure for a torsion bar of an automobile rear cover hinge. The abnormal-noise prevention structure comprises a sheet metal part of the hinge, wherein a torsion bar accommodating groove is formed in the sheet metal part of the hinge; the torsion bar is placed in the torsion bar accommodating groove; a copper bush is arranged in the torsion bar accommodating groove; and when placed in the torsion bar accommodating groove, the torsion bar is in contact with the copper bush. As the copper bush is arranged at the contact position of the sheet metal part of the hinge and the torsion bar, the sheet metal part is protected by the copper bush, abnormal noise caused by direct friction against the sheet metal part is reduced, and accordingly, the service life of the hinge is prolonged.