The invention relates to a liquid phase preparation method of superfine nickel metal powder, which more particularly comprises the steps of: evenly mixing nickel tetracarbonyl, organic carrier liquid and dispersing agent; injecting the mixture into a container with protective gas and then heating; stirring in the whole process with the reaction temperature of 50-200 DEG C and the reaction time of0.1-12h; and finally, extracting the superfine nickel metal powder by vacuum filtration or centrifugal separation. Compared with the existing carbonyl metal gas phase decomposition method, the liquidphase preparation method only needs lower reaction temperature and shorter reaction time, is simple in technique and high in production efficiency. More important, the superfine nickel metal powder prepared by the method has high purity, good dispersibility and controllable granularity, and is not easily oxidized.