A magnetic fluid damper model is designed, and then the experimental platform that satisfies the condition of micro-displacement and micro-acceleration with low frequency is designed according to the working principle of damper in order to measure the effectiveness of the magnetic fluid damper and test the damping effect of the damper by various parameters. Then a series of experiments are done on the experimental platform according to experimental requirements, the results show that the range of frequency that the experimental platform can meet is 0.74Hz～5.75Hz. Compared with the free oscillation of the elastic cantilever beam, the full decay time of vibration of the beam when the damper is installed is reduced by about 65％. The logarithmic decay rate increases at the beginning and then decreases, after that it increases again, when the frequency increases. But the logarithmic decay rate increases when the amplitude of vibration increases. For different lengths of cantilever oscillation, the magnetic fluid damper has very good damping effect on the vibration of the cantilever, and the damping effect is better when the length of the cantilever is 0.7m. It can also be found that there is good result of damping for the cantilever oscillation with different initial amplitude.