The invention relates to a reactive yellow dye for ink jet printing and a preparation method and application thereof, belonging to the field of fine chemical industry. The reactive yellow dye shown inthe formula(I)has higher solubility, good fixation rate and color fastness, high stability after dyeing and bright color light, can be widely applied to dip dyeing, pad dyeing and ink jet printing ofcotton, hemp and artificial cotton fiber fabrics, has low production cost, and can be popularized and applied on a large scale.