The utility model provides a surface-mounted discharge tube which comprises a discharge electrode, an insulating tube and a lead wire, wherein the discharge electrode comprises a first electrode and a second electrode; the first electrode and the second electrode are welded at two ends of the insulating tube respectively; a gap is reserved between the first electrode and the second electrode; the lead wire comprises a first lead wire connected with the first electrode and a second lead wire connected with the second electrode; and the surface-mounted sections of the first lead wire and the second lead wire are flat. The utility model has the benefits that because the lead wires welded with the electrodes can be better used for surface mounting after being specially formed in flat type, thereby adsorbing welding flux; and compared with the prior art, the utility model reduces the cost and the complexity of the manufacturing process, and eliminates the process bottleneck of incapability of completing the metal cutting and punching caused by higher hardness of electrode materials or larger diameter of electrode bars.