The invention relates to a tissue control method for near-eutectic cast aluminum-
silicon alloy. The method comprises the following steps: preparing raw materials, namely commercially pure aluminum, ZL102, Al-Sr, Al-B and one of Al-La, Al-Ce and Al-Re, in a manner that the raw materials contain the following ingredients in percentage by
mass: 9-12% of Si, 0.05-0.5% of B, 0.01-0.1% of La, Ce or RE, 0.02-0.03% of Sr and the balance of Al; then carrying out
smelting of the following steps: preheating the raw materials, heating an empty furnace, then, adding ZL102 and the commercially pure aluminum, and heating for melting; adding a
sodium-free refining agent of which the
mass accounts for 0.4-0.6% the total
mass of the raw materials; treating a melt treated in the step (2) by adopting a
boron and rare-earth combined refining method; carrying out secondary refining treatment on the melt; cooling to 690-700 DEG C, adding an Al-Sr alterant after temperature is stabilized, pressing the alterant into the bottom of the melt, and stirring, so as to enable the alterant to be thoroughly dissolved into the melt; carrying out heat preservation for 10-20 minutes at the temperature of 700 DEG C, then, heating to 720-730 DEG C,
casting the melt into a
metal mold which is preheated at the temperature of 200-250 DEG C, cooling, and then, taking out a
casting.