The invention provides a high-strength high-heat-conductivity aluminum silicone alloy and a preparation method and application thereof. The aluminum silicone alloy is composed of the following components including, by weight, 7%-9% of Si, 0.1%-2% of Ni, smaller than 0.1% of Mg, smaller than 0.1% of Cu, 0.5%-1% of Fe, smaller than 0.1% of Mn, and the balance Al and inevitable impurities. The preparation method comprises the following steps that commercial purity aluminum with the aluminum content larger than or equal to 99.7% and an aluminum silicone intermediate alloy are added into a smeltingcontainer at the temperature of 700 DEG C-850 DEG C, and after the commercial purity aluminum and the aluminum silicon intermediate alloy are melted completely, other alloy elements are added in an intermediate alloy form according to the ratio and mixed to form a melt; the melt is subjected to degassing refining treatment with inert gas and standing for 10-60 minutes, and then drossing is carried out; the melt obtained after drossing is cooled and poured in a die; and heat is preserved for 0.5-3 h at the temperature of 150 DEG C-400 DEG C, and then cooling is carried out. The aluminum alloycan meet the requirement of preparation materials of LED illumination lamps and communicating equipment for heat conduction and strength properties, and therefore use safety and reliability of the LEDillumination lamps and the communicating equipment are improved greatly.