Laser-CMT hybrid welding is a new laser arc hybrid welding technology combining high-energy beam laser and cold metal transition (CMT) technique. Compared with traditional laser MIG hybrid welding, CMT process has extremely low heat input, more stable welding process, which can realize high-efficiency spatter free welding process and is easy to obtain high-quality welded joints. This technology has attracted more and more attention from scholars at home and abroad. It has been continuously explored and recognized in terms of refractory and weldable connection, and has a wide range of industrial application scenarios. Based on the analysis of relevant literature, this paper first summarizes the composition and connotation of laser-CMT hybrid welding system, then reviews the development status of weld formation, droplet transfer, weld pool morphology and welded joints in laser-CMT hybrid welding, as well as some existing problems. Secondly, the necessity and research method of simulation of laser-CMT hybrid welding process are put forward. Finally, the future development direction and research focus of laser-CMT hybrid welding technology are prospected.