The invention belongs to the field of functional paint, and particularly relates to paint of chill for casting an aluminum alloy. The paint comprises the following components in percent by weight: 50 to 70 percent of graphite powder, 10 to 20 percent of nano boron nitride powder, 2 to 4 percent of sodium bentonite, 5 to 7 percent of abietate or hydrogenated rosin ethyl ester, 2 to 10 percent of hexamine and the balance being ethanol. Compared with the prior art, the paint has the advantages: (1) a hole defect can be obviously eliminated in the application process; (2) by adding the nano boron nitride powder, the high temperature resistance of the paint can be improved; by adding the silicon powder, the comprehensive performance of the paint is further improved; (3) the selected graphite powder is silicified, so that the thermal shock resistance of the paint can be improved.