A high-speed stack molding device utilizing a rotary multi-mould, including a base having a moving rail formed on an upper surface thereof; a mould-rotating unit disposed on the base and supporting both ends of a multi-mould to selectively rotate the multi-mould; a movable driving frame including vertical frames extending upward from slide-coupling parts, which are moved forward and rearward along the moving rail and an upper frame connecting upper end portions of the vertical frames to cover an upper portion of the multi-mould; a fiber-reinforced resin supplying unit connected to the movable driving frame and supplying a fiber discharged from a supplying roller to the upper frame through pressure rollers; and a stacking head provided at an end portion of an articulated robot arm connected operably to the upper frame for pressurizing and stacking the fiber-reinforced resin.