The invention discloses a 
plant fiber reinforced inorganic light composite which is mainly prepared from 
magnesium chloride hexahydrate, 
magnesium sulfate heptahydrate, light calcined magnesia, water, a 
water reducer, a reinforcing agent, reinforcing fibers, a 
foaming agent, an exciting agent, a stabilizer and adjusting admixture. The preparation method comprises steps as follows: 
magnesium chloride hexahydrate, 
magnesium sulfate heptahydrate and water are mixed to be made into a 
saline solution; light calcined magnesia, the 
water reducer and the reinforcing agent are added to the 
saline solution, the mixture is stirred at a 
constant speed, and an inorganic 
sizing material is obtained; the reinforcing fibers are added to the inorganic 
sizing material and stirred at a 
constant speed, the adjusting admixture, the stabilizer and the exciting agent are dropwise added slowly, finally, the 
foaming agent is added quickly, the mixture is stirred at a high speed, and a foamed inorganic 
sizing material is obtained; the foamed inorganic sizing material is poured into a die, left to stand for foaming, removed from the die and maintained, and the 
plant fiber reinforced inorganic light composite is obtained. The composite has the advantages of 
high pressure resistance, high bending resistance, 
low density, no 
formaldehyde, 
aging resistance, 
mildew resistance, termite resistance, 
moisture-proof performance, no deformation, sound and heat insulation, good heat preservation and the like.