The invention relates to a quickly shaped diatomite composition with high strength and high function and a manufacturing method thereof. The composition comprises 100 portions of diatomite, 0 to 1,000 portions of stuffing, 50 to 300 portions of adhesive, 0 to 30 portions of antibacterial agent, and 0 to 30 portions of shaping and processing aid. Formulation and shaping manufacturing technology ofthe diatomite composition radically solve the problems that a common diatomite product has long producing and shaping period and low manufacturing efficiency; and the obtained product has the advantages of good mechanical property, light weight and low formaldehyde release, and has good functional properties such as flame retarding, water proofing, bacteria resistance and the like. The diatomite composition is applied to be manufactured into plates and profiles, can replace wood and artificial boards, and is used for products such as indoor and outdoor ornaments, office and household furniture, furniture components, acoustics, internal ornaments of vehicles, wall panels, security doors, wall boards, partition wall boards, packing materials, bed boards, floor, solid door frames, shutters, and the like.