A method prevents an abnormal vibration of a hybrid vehicle. In the method, information is inputted into an engine management system (EMS) by sensing an engine rpm, a transmission rpm, a gear shift, a signal of an accelerator pedal sensor (APS), and an engine torque. It is determined whether or not a current engine rpm and a current engine torque fall within a predetermined rpm and damper reflection torque range that is a range of abnormal vibration occurrence. The engine torque and a motor torque are mutually corrected when the current engine torque falls within the range of the abnormal vibration occurrence. Here, the abnormal vibration is prevented by avoiding an inflection point of a damper at a resonance point of a driving system while maintaining a total driving torque.