Foamed glass heat insulation plate and preparation method thereof

The invention discloses a foamed glass heat insulation plate and a preparation method thereof. The foamed glass heat insulation plate includes the following raw materials: a magnesium chloride water solution being 21-32 in baume degree, magnesium oxide, foamed glass, an additive, a foamer and a foam stabilizer, wherein the mass ratio of the magnesium oxide to the magnesium chloride water solution is 5-10:5; the mass ratio of the foamed glass to the magnesium chloride water solution is 1-7:10; the mass of the additive accounts for 0-10% of the total mass of the magnesium chloride, the magnesium oxide and the foamed glass; the mass of the foamer accounts for 0-2% of the total mass of the magnesium chloride, the magnesium oxide, the foamed glass and the additive; and the mass of the foam stabilizer accounts for 0-2% of the total mass of the magnesium chloride, the magnesium oxide, the foamed glass and the additive. The heat insulation plate is prepared from waste foamed glass and reduces production cost of magne