The invention provides a structural steel welding rod and a method for preparing the same. The structural steel welding rod comprises welding cores and coating. The coating wraps the welding cores. The coating comprises, by weight, 5-35 parts of titanium dioxide powder, 20-27 parts of reduction titanium, 7-8.5 parts of medium manganese, 7-10 parts of lime mud, 5 parts of mica, 3 parts of argil, 2-4 parts of feldspar, 7-8.5 parts of marble, 0-2 parts of wood meal, 1-3 parts of celluloses, 0-30 parts of rutile and 0-5 parts of illite. The method includes steps of adhesive adding and wet mixing, press coating and drying. The diameters of the welding cores are 2-4 mm. The structural steel welding rod and the method have the advantages that processes for manufacturing the structural steel welding rod are simple, the coating and the welding cores are good in connection performance, the structural steel welding rod generates little smoke and is low in spark splashing during use, and welded joints are attractive and are high in smooth finish; the structural steel welding rod is good in secondary arc strike property and is environmentally friendly and safe during use, slag is easy to remove, and the work efficiency can be greatly improved.