The invention discloses a copper steel composite material, an arc additive preparing method and application of the copper steel composite material and a tin bronze alloy. The composite material is composed of a copper alloy layer and a steel layer. The copper alloy layer is novel tin bronze and comprises the following components including, by weight percent, 5%-10% of Sn, 0.15%-0.35% of Al, 0.05%-0.2% of Si, smaller than 0.01% of Pb, smaller than 0.01% of Ni and the balance Cu. A preparing technology of the composite material includes the steps that firstly, casting of a novel tin bronze alloybar is conducted; secondly, the alloy bar is subjected to extruding and drawing technologies, and a wire with the diameter being 0.8 mm to 1.6 mm is prepared; and thirdly, the wire is arranged on thesurface of a steel plate in an arc additive manner, and the copper/steel composite material is obtained. The copper steel composite material is high in combination strength and has dendrite tissue which is compact, uniform and fine, and the wear reducing and resisting performance and the bearing performance are high.