The present invention relates to a formula for preparing aluminium-titanium-boron wire intermediate alloy and its preparation process. Said formula for producing every ton product includes 250-290 kg of potassium fluorotitanate, 110-130 kg of potassium fluoroborate and 1000-1100 kg of pure aluminium ingot. Its preparation process includes the following steps: (1) mixing potassium fluorotitanate and potassium fluoroborate; (2), placing aluminium ingot into melting furnace, molting and heating to 750-800 deg.C; (3), adopting blowing method to make the potassium fluorotitanate and potassium fluoroborate mixture be injected into the molten aluminium; (4), continuously melting for 3-8 min, stopping, standing still for 35-45 min, removing dregs; (5), placing the molten alloy aluminium into heat-insulating furnace, introducing argon gas, stirring and heating simultaneously, and (6), heating to 780-820 deg.C, discharging molten aluminium, casting it into ingot, rolling it to obtain the invented aluminium-titanium-boron wire alloy.