Yes, Iron Man died in the 4th Women's Federation. In the movie, he grabbed Thanos's gloves, drove away infinite gloves with mortal bodies, and reduced Thanos and his army to ashes. Iron man closed his eyes forever because of the exhaustion of energy. His last words were only five words: I am Iron Man.

In reality, it is normal for Iron Man to die because Downey's contract with Marvel Comics is coming to an end.