Disclosed is a Ni-Al alloy anode for molten carbonate fuel cell made by in-situ sintering the Ni-Al alloy. Further, disclosed is a method for preparing the same comprising steps of preparing a sheet with Ni-Al alloy powders (S1); and installing the sheet in a fuel cell without any heat treatment for sintering the Ni-Al alloy in the sheet and then in-situ sintering the Ni-Al alloy in the sheet during a pretreatment process of the cell with the sheet (S2), wherein a reaction activity of the Ni-Al alloy anode can be maintained, the method is simple and economic, and a mass production of the Ni-Al alloy anode and a scale-up in the method are easy.