The invention discloses a preparation method for Ni-Al series intermetallic compound powder. The Ni-Al series intermetallic compound powder is prepared through sintering in a hydrogen atmosphere by using Al3C3 powder and nickel powder as reactants. The Ni-Al series intermetallic compound powder which is prepared by adopting the method disclosed by the invention has the advantages that the grain size is fine, the dispersibility is good, the grain size distribution is even, the component is single, the impurity content is low, the production process is simple and the large-scale production is easy to realize.