The emergency maintenance of submarine facility and in-situ remanufacturing of emergencies are the focus of current marine engineering restoration. In this study, synchronous powder feeding underwater laser cladding is proposed, which uses high-energy laser as the heat source, the substrate is completely immersed in the water environment, and the functional coating suitable for underwater components is obtained through special powder feeding nozzle and process parameter adjustment. In view of the shortcomings of the current preset powder underwater laser cladding, this paper innovatively prepared Ni60 and Fe-Cr alloy coatings on A32 deck steel by synchronous powder feeding underwater laser cladding. The effects of process parameters different from atmospheric cladding on the morphology of the coating were analyzed. The structural characteristics of the underwater coating were analyzed by analyzing the microstructure and electrochemical properties of the coating. Through experimental exploration and numerical simulation results, it is considered that the tissue structure of the synchronous powder feeding is similar to the conventional atmospheric laser cladding, and the depth of the interface heat affected zone is shallower. The area of the equiaxed fine-grained area of the coating is larger. The coating is dense and has electrochemical corrosion resistance.