Preparation method for producing household aluminum foil by slightly changing 8021 alloy

Method invention provides a preparation method for producing household aluminum foil by slightly changing 8021 alloy. According to the method, slight changes are made on the basis of the 8021 alloy, wherein Si is increased from 0.1-0.2 to 0.3-0.5, Fe is decreased from 1.3-1.6 to 1.1-1.3, Cu is decreased from 0.05-0.02, Ti is increased from 0.01-0.02 to 0.02-0.035, and Al contains, by weight, 70-80pars of electrolytic aluminum liquid and 20-30 parts of aluminum ingots with the purity larger than or equal to 99.7%. An aluminum roll with the thickness of 3-5 mm is prepared through a Hazelett continuous casting and rolling machine, and then the household aluminum foil is prepared in the steps of cold rolling, longitudinal shearing and edge cutting, foil rolling, finished product slitting, finished product annealing, inspection and packaging. The links such as large-plate ingot casting, re-heating of an ingot blank saw head milling surface and large-machining-amount rough rolling cogging are omitted, energy is sav