Automatic machining production line for steel component parts

The utility model relates to an automatic machining production line for steel component parts. The automatic machining production line comprises a part assembling unit, a part welding unit, a first circulation channel and a second circulation channel which are arranged side by side and arranged on the two sides of the part assembling unit and the part welding unit. The part assembling unit comprises two assembling platforms and an assembling track, an assembling robot and a part tray are arranged on the assembling track, and the assembling robot comprises two working arms which take parts from the part tray and send the parts to the two assembling platforms respectively; the part welding unit comprises two welding platforms, two welding robots are arranged on the welding track, proximity sensors are arranged on the opposite sides of the two welding robots, and the welding robots exchange welding targets according to proximity signals. The machining unit is compact, the space occupied by a production line is s