Abstract: A stabilizer includes a receiving device, a guide plate element for connection with a chain, and a clutch device. The guide plate element is movably mounted on the receiving device and performing a rotation state through an elastic element. The clutch device is mounted on the receiving device and connected with the guide plate element and used for providing one-way resistance. When a vehicle body jounces, the guide plate element rotates upwardly under force, the chain is tensioned, and the clutch device is in a free rotation state. When the guide plate element moves towards an opposite direction under force, the clutch device provides one-way resistance, so that the guide plate element can maintain a tensioning state of the chain for a longer time, and the effect of stabilizing the chain is achieved.