TC4 alloy cladding layer is prepared on TC4 titanium alloy substrate with laser additive manufacturing (LDM) technology, and the microstructure, microhardness and electrochemical corrosion resistance of the cladding layers in sulfuric acid solution are studied. The results show that the main phase of the cladding layers is α-Ti, and the fine acicular α' martensite is formed near the β grain boundary, showing orthogonal basket-weave microstructure. With the increase of the scanning speed, the average microhardness of the cladding layers increases first and then decreases, the corrosion current density decreases first and then increases, and the charge transfer resistance increases first and then decreases, that is, its corrosion resistance also strengthens first and then weakens. In contrast, when the scanning speed is 10 mm/s, the cladding layer has the highest average microhardness (390 HV), minimum corrosion current density (1.2337 μA·cm -2), and maximum charge transfer resistance (11500 Ω·cm -2), and at this time, the cladding layer has better resistance to electrochemical corrosion.