A flexible fiber reinforcing composite gypsum board is mainly formed through composition of a shaping connection machine component, fiber thorn ropes, semi-hydrated gypsum powder and fiber cloths or fiber cloth board-shaped bags. The fiber thorn ropes are made of long fiber and short fiber, and longitudinally and / or transversely and evenly distributed among the fiber cloths or in the fiber clothboard-shaped bags in a single rowed or multiple rowed mode, and the two ends of each fiber thorn rope are fixed to the edge of the flexible fiber reinforcing gypsum board correspondingly, or fixedlyconnected with a shaping plate edge of the flexible fiber reinforcing gypsum board. The fiber cloths or the fiber cloth board-shaped bags form the board face of the flexible gypsum board. A gap of a three-dimensional fiber space formed by the fiber cloths or the fiber cloth board-shaped bags and the fiber thorn ropes is filled with the semi-hydrated gypsum powder. The flexible fiber reinforcing composite gypsum board material is low in weight, can resist earthquakes and impact, can insulate and preserve heat, and absorb and insulate sound, and is fireproof, energy conservation and emission reduction and environmental protection are facilitated, and the flexible fiber reinforcing composite gypsum board is convenient to transport, construct and mount.