The invention discloses a method for hydro-thermal synthesis of a mesoporous material by use of waste glass, and the method comprises the following steps: (1) mechanically crushing, grinding, sieving and drying the waste glass for standby use; (2) adding Ca (OH) 2 with the mass of 30-40% of the mass of the waste glass into the ground waste glass, mixing evenly for hydro-thermal treatment for 12-14h at 200 to 220 DEG C, filtering and drying to obtain the mesoporous material. The method for hydro-thermal synthesis of the mesoporous material by use of the waste glass has the advantages of simple process, easy implementation, low energy consumption and great environmental protection significance, the synthesized mesoporous material can be used for sewage treatment or heavy metal adsorption, and a new way for recovery and application of the waste glass is provided.