Abstract: To study the burnt rock curtain grouting technology of overburden 4^-2 coal in Zhangjiaomao Coal Mine, the hydro-geological characteristics of burnt rock and the causes of curtain engineering are analyzed, and the design of curtain engineering is discussed, and the sequence of drilling construction is discussed. The construction method of grouting curtain is studied in the aspects of grouting flow interference, grouting method optimization and so on. The engineering practice shows that the grouting curtain construction of overburden burnt rock on the working face should be based on the sequence of the first internal discharge and then the outer drainage, and the method of double position bidirectional comprehensive drainage grouting should be adopted, and the different burnt rock sections on the curtain line should be partitioned grouting.