The invention relates to an energy-saving and short-flow manufacturing method of a wheel hub with an in-situ particle reinforced A356 alloy. The main features of the method are as follows: (1) A356 alloy melt is prepared with pure metals Al and Mg as well as crystalline silicon through one-step melting, in-situ multi-phase reinforcing particles of ZrB2 (or TiB2), Al3Zr (or Al3Ti) and Al2O3 are synthesized through reactions synthesis of the melt in a pulsed magnetic field, the sizes of a majority of particles are at the sub-micron (0.1-1mum) level, and the sizes of a minority of particles are at the micron (1-4mum) level; and (2) a wheel hub is formed through low-pressure casting or metal gravity casting of the synthesized composite material melt, no solid solution is needed, and next procedure can be carried out after direct artificial aging treatment, thereby realizing the short-flow thermal treatment. The novel method for manufacturing of the A356 alloy wheel hub in the invention not only can effectively improve the mechanical property of the aluminum wheel hub and prolong the service life of the aluminum wheel hub, but also can significantly reduce the solid solution heat treatment procedure, thereby greatly reducing the energy consumption and improving the production efficiency.