The invention relates to a method for preparing porous bone cement by using metal porogen. The method comprises the following steps of: weighing beta-TCP and Ca(H2PO4)2.H2O powder according to the molar ratio of 1:1; grinding the beta-TCP and the Ca(H2PO4)2.H2O powder to prepare composite powder; adding citric acid solution of 0.5 mol/L into the composite powder for mixing; and adding metal powder into the mixture to naturally foam and cure to obtain the porous bone cement material. Metal (such as Mg, Ca, Al and the like) powder which can serve as a bone repair material serves as the porogen and is added into bone cement slurry, and reactive metal and curing liquid are subjected to chemical reaction easily to generate gas which is uniformly distributed in the bone cement substrate to form holes, so aperture and porosity can be controlled by controlling the grain size and the doping amount of the porogen and the penetrating performance is high.