The invention discloses a Al-30Si aluminum alloy containing Sr, B, Ti and Zr and a preparation process thereof. The high-silicon aluminum alloy is prepared by pouring an aluminum alloy molten mass at 750 DEG C into a metal mold with 200 DEG C in an atmospheric environment. The Al-30Si mother alloy is prepared by the following steps: smelting industrial pure aluminum with the purity of higher than 99.8 Wt% and silicon metal with the purity of higher than 99.5 Wt% in a graphite crucible by using a well-type resistance furnace, keeping the temperature at 850 DEG C for 4 hours, carrying out refining and degassing on the alloy liquid with hexachloroethane at 750 DEG C, and keeping the temperature for 30 minutes. The elements Sr, B, Ti and Zr are alloyed by respectively adding Al-10Sr, Al-5Ti-1B, Al-10Zr and other alloys at 720 DEG C and keeping the temperature for 30 minutes. The aluminum-silicon alloy comprises the following chemical components: 0.03-0.09 Wt% of Sr, 0.01-0.05 Wt% of B, 0.05-0.25 Wt% of Ti, 0.03-0.09 Wt% of Zr, 30 Wt% Si and the balance of Al. The tensile strength of the alloy is 149.4-245.4 MPa, the hardness is 37.5-82.1 HBW, and the resistivity is 0.107-0.127 ohm m.