The invention discloses a liquid-solid diffusion experiment method for uranium metal. The liquid-solid diffusion experiment method for the uranium metal includes the furnace charging process, the smelting process, the diffusion process and the quenching process, and a liquid-state gallium-indium alloy is adopted as a cooling quenching medium. The liquid-solid diffusion experiment effect is good; the crucible and cavity design is adopted, fast cooling can be performed after smelting, and a needed diffusion state is well reserved; and meanwhile, according to the method, the diffusion degree canbe changed as required, the purpose of researching the liquid-solid melting diffusion mechanism and behavior is achieved, an obtained sample is obvious in interface, and the diffusion experiment effect is good.