The present invention relates to a variable rigidity initiative power absorber applied to vibration damping for machinery, electrical equipment and noise control. The fault that the control band width of the passive control type absorber is too narrow, the control energy needed by initiative control type absorber is excessive and the vibration absorption effect of semi- initiative control type absorber is insufficient is solved. The structure feature of the absorber is that: an execution unit includes a base frame, the top of the base frame is disposed with a pair of base seats, the base seats are disposed with annular guide rods, and the two sides of the opening of the annular guide rod are respectively connected with magnetic current variable elastic bodies, the annular guide rods are connected with movable mass blocks, power mechanisms are disposed at the lower part of the power mass blocks. The invention has good vibration absorption effect, wide oscillation damping frequency band, less consume energy, the input energy is less than the initiative control absorber, therefore, the stability is better than the initiative control absorber; the absorber is simple in structure, easy in control method, and high in system reliability.