The invention relates to a fractured extra-low-permeability reservoir dynamic imbibition stimulation experiment device and application thereof. The device comprises a confining pressure pump, a constant flow pump and a constant temperature tank body, wherein an intermediate container, a core imbibition chamber, an oil-water metering module and a heating device are arranged in the constant temperature tank body; the oil-water metering module comprises a water quantity metering device and an oil quantity metering device which are communicated with each other through a fourth communication valve; an opening formed in the top end of the core imbibition chamber is communicated with the oil-water metering module, and an opening formed in the bottom end of the core imbibition chamber is communicated with the constant flow pump through the intermediate container. The device can measure the change relation of imbibition oil production of different-physical-property low permeability-extra-low permeability cores at a certain temperature and pressure along with time; furthermore, the effects of different parameters of fracture size, water drive speed and water drive period on the imbibition amount can be researched.