The invention discloses a method for preventing settlement of magneto-rheological fluid of a magneto-rheological damper. The cylinder of a magneto-rheological damper (1) is provided with a fluid inlet and a fluid outlet, and a self-circulating device is arranged between the liquid inlet and the liquid outlet. When the magneto-rheological damper is kept static for a long time, the self-circulating device is started regularly, so that the magneto-rheological fluid can circulate through the self-circulating device, thereby ensuring the long-term uniformity and stability of the magneto-rheological fluid. The self-circulating device is mainly composed of a micro solenoid valve (2) and a micro pump (5), wherein the micro solenoid valve (2) and the micro pump (5) are respectively connected to a controller (3) on the magneto-rheological damper (1); one end of the micro solenoid (2) is connected to the fluid outlet on the cylinder of the magneto-rheological damper through a pipeline (7), the other end is connected to the micro pump, the micro pump (5) is connected to the fluid inlet on the cylinder of the magneto-rheological damper through the pipeline. The invention is applicable to the magneto-rheological damper kept static for a long time, and broadens the application prospects of the magneto-rheological damper.