The invention discloses an anti-rust wear-resistant harvester tensioning wheel support welded structure. The tensioning wheel support welded structure comprises supporting plates (1), a cover plate (2), an anti-rust layer (3), a wear-resistant layer (4), a base plate (6), a tensioning wheel clamping groove (7) and a rail (8); the supporting plates (1) are symmetrically arranged on one side of thebase plate (6); the base plate (6) is connected with the supporting plates (1) through welding; the supporting plates (1) are connected with arc-shaped plates (9) through welding; the arc-shaped plates (9) are connected with the cover plate (2) through welding; the rail (8) is formed in the cover plate (2); the tensioning wheel clamping groove (7) is formed in the inner side of the connecting partof the cover plate (2) and the supporting plate (1); the supporting plates (1), the cover plate (2) and the base plate (6) are all provided with the anti-rust layer (3) and the wear-resistant layer (4); and the anti-rust layer (3) is adhered to the wear-resistant layer (4).