Recently, laser keyhole welding technique has brought it widespread attention due to its good quality and high productivity in joining dissimilar alloys. The laser keyhole welding technique used in joining dissimilar alloys can be classified as keyhole welding-brazing and keyhole welding according to whether the steel base materials are melted or not at the interface of steel/Al joints. The research status of laser keyhole welding-brazed steel/Al joints is discussed in terms of different laser beam sources in details. In considering laser keyhole welding of steel/Al joints, the research progress in abroad and at home is described by means of different joint configurations. Finally, a very import research direction of dissimilar joining steel/Al joints using laser keyhole welding technique is proposed.