The invention relates to an auxiliary device for angle steel galvanization, in particular to a numerical control penetrating and hanging line device for angle steel galvanization and a penetrating and hanging process. The numerical control penetrating and hanging line device comprises a worktable, a material storage rack, an angle steel positioning seat, a material turnover device, a feeding roller way, a material-passing roller way, a material-penetrating comb, a movable guide rail and a comb clamping lifting traveling trolley, wherein the material turnover device is mounted between the angle steel positioning seat and the feeding roller way and can easily turn over and convey galvanized angle steel falling into the angle steel positioning seat to the preset feeding roller way, so that seamless connection of the angle steel and feeding and conveying processes is realized and the conveying efficiency and the conveying quality of the galvanized angle steel are improved. Angle steel feeding, conveying and penetrating-hanging processes are integrated on the same equipment, so that the occupied site space is small, the crane occupation time is short, and the safety coefficient is high; the whole penetrating and hanging operation does not need human assistance, and the galvanized angle steel is controlled through the numerical control device to realize the steps, so that the labor intensity of penetrating and hanging is greatly reduced and the penetrating and hanging efficiency is improved.