The invention discloses a dynamic mixing method and device utilizing the eccentric-load drive of an eccentric rotor. According to the dynamic mixing method, an eccentric mixing ring provided with a flow channel is arranged at the tail end of the eccentric rotor, so that the eccentric mixing ring can be driven by the eccentric rotor to perform revolution motion when the eccentric rotor performs rotation motion and performs constant-speed reverse revolution motion around the center of a stator simultaneously, and then a soft material flowing through the flow channel on the eccentric mixing ring can be further mixed. The dynamic mixing device comprises the stator, the eccentric rotor, a supporting ring and the eccentric mixing ring, wherein the eccentric rotor is arranged inside the stator; the eccentric mixing ring is arranged at the tail end of the eccentric rotor; the periphery of the eccentric mixing ring is connected with the stator through the supporting ring; and the supporting ring is fixed on the inner side of the stator. The dynamic mixing method and device disclosed by the invention have the following advantages: on the one hand, through arrangement of the eccentric mixing ring, the soft material can be further mixed, thereby improving the soft material mixing effect; and on the other hand, through arrangement of the eccentric mixing ring, the eccentric load can be balanced, thereby reducing the extrusion vibration of the eccentric rotor, effectively protecting the eccentric rotor from deformation, and enabling the eccentric rotor to run more stably.