The invention discloses a catalyst capable of directly loading reactive metals on metallic packing. The catalyst is prepared by the following method, and the method comprises the following steps: 1, filling the metallic packing into a reactor, wherein the filling volume of the packing is 80-90% of the volume of the reactor, and replacing a treatment device and a pipeline system with nitrogen; 2, pumping a treatment solution in a solution storage tank into a preheater by a pump, enabling the solution to enter the reactor in the first step, condensing the gas exhausted from the reactor and emptying, collecting the discharged liquid into the solution storage tank to serve as the treatment solution to continuously participate in treatment; continuously treating for 1-2 hours in the reactor, thereby obtaining the reactive metal/metallic packing catalyst. The catalyst prepared by the method disclosed by the invention is high in reactive metal utilization rate, the heat and mass transfer superficial area is large, the resistance is low, and any inner-diffusion effect is avoided in the reaction process.