The utility model relates to a nanometer injection mold's a line position mechanism, including the cope match -plate pattern, the lower bolster, go up the mould, the lower mould, the big position seat and the position mold insert of going of going, the big position seat of going is installed in the lower bolster top, the big die joint of position seat between last mould and lower mould of going, go position mold insert fixed mounting in big front side of going the position seat, it still includes the little position seat of going, son and pneumatic cylinder are gone into to the position mold insert of going, the position mold insert of going is equipped with and supplies to go the position mold insert to go into sub - male hole, sub - fixed mounting is gone into at little front end of going the position seat to the position mold insert of going, little piston rod of going position seat rear end fixed connection pneumatic cylinder, the little big position seat of going of position seat below slidable mounting of going, the position mold insert income entering of going is gone in the mold insert of position, can not weigh the mould wounded or insert and hinder the nanometer aluminum component, need not the running maintenance mould, and improves the production efficiency, the mould life extended, guarantee normal production, additionally, the tip that the son is gone into to the position mold insert of going can not collide with mould benevolence mutually, the tip that the son is gone into to the position mold insert of going does not drape over one's shoulders the cutting edge of a knife or a sword with regard to not producing yet.