Provided is a method for fabricating a tin-based negative-electrode material by vapor deposition; first, nano-tin is mixed with a transition-metal compound aqueous solution, and the mixture is heated until moisture evaporates; a reducing agent is used to reduce the nano-tin carrying the transition-metal compound, then an amorphous carbon source is used to deposit amorphous carbon onto the nano-tin carrying the transition metal; lastly, an acidic medium solution is used to remove the transition metal on the nano-tin having the amorphous carbon deposited thereon. A transition metal is used as a catalyst, such that the amorphous carbon and the nano-tin are chemically bonded together; the amorphous carbon is deposited onto the nano-tin to obtain a composite negative-electrode material of nano-tin and amorphous carbon; the amorphous carbon has a porous structure that mitigates the tin-powder volume expansion resulting from electrical charging and discharging; at the same time, the vapor deposition uniformly modifi
