The invention discloses an aluminium-stibium intermediate alloy and a preparation method application thereof. The aluminium-stibium intermediate alloy is prepared from the following components in mass percentage: 89.0-97.0% of aluminium, and 3.0-11.0% of stibium, wherein stibium is dispersed and distributed in the intermediate alloy in the state of submicrometer-scale aluminium antimonide phase. The aluminium-stibium intermediate alloy can be applied to casting production of aluminium-silicon alloy. The aluminium-stibium intermediate alloy disclosed by the invention is high in dispersion degree of submicrometer-scale aluminium antimonide phase, low in segregation degree, high in diffusion rate, and good in refining metamorphism effect of eutectic silicon and primary silicon, and can solve the technical problems of thick silicon of aluminium-silicon alloy and high air suction tendency during melt processing.