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The mutual interplay between superconductivity and magnetism in superconductor/ferromagnet heterostructures may give rise to unusual proximity effects beyond current knowledge.Especially,spin-triplet Cooper pairs could be created at carefully engineered superconductor/ferromagnet interfaces.Here we report a giant proximity effect on spin dynamics in superconductor/ferromagnet/superconductor Josephson junctions.Below the superconducting transition temperature TC,the ferromagnetic resonance field at X-band (～9.0GHz) shifts rapidly to a lower field with decreasing temperature.In strong contrast,this phenomenon is absent in ferromagnet/superconductor bilayers and superconductor/insulator/ferromagnet/superconductor multilayers.Such an intriguing phenomenon can not be interpreted 5y the conventional Meissner effect.Instead,we propose that the strong influence on spin dynamics could be due to spin-transfer torque associated with spin-triplet supercurrents in ferromagnetic Josephson junctions with precessing magnetization.