A low temperature heat processing method of single feeder head eutectic Al-Si alloy piston material is processed according to following steps: heating a cast piston in a well-type furnace to 480+(-)5degrees centigrade, keeping the temperature for 1.5 h, then taking out from the furnace; using the water of 50 to 80 degrees centigrade to quench and cool; after quenching, heating the well-type agingfurnace to 160+(-) degrees centigrade along the furnace, performing manual aging after keeping temperature for 5 , then taking out from the furnace and performing air cooling, finishing the whole process of heat process of the piston material. Each performance index of the eutectic Al-Si alloy piston material after the low temperature heat processing exceeds the each performance index order by the internal-combustion engine piston technical condition GB/T1148-93. This technical method can guarantees the piston quality and can reduce the manufacturing cost.