Low-foam alkaline cleaner and aluminum alloy part cleaning method

The invention discloses a low-foam alkaline cleaner and an aluminum alloy part cleaning method. The low-foam alkaline cleaner comprises the following materials in parts by mass: 9.5-15.5 parts of sodium dodecyl benzene sulfonate, 19.5-25.5 parts of sodium hydroxide, 11.5-18.5 parts of sodium carbonate, 10.5-14.5 parts of sodium metasilicate, 4.5-8.8 parts of octaphenyl polyoxyethyiene and the balance of water. The low-foam alkaline cleaner is excellent in cleaning capability, long in service life and low in cost, generates less foam in the cleaning process, and causes less pollution to procedures after cleaning; and by use of the low-foam alkaline cleaner, the aluminum alloy part cleaning method is better in cleaning effect and lower in cost.