The invention proposes a double-station full-automatic casting and welding machine. The double-station full-automatic casting and welding machine is provided with double casting and welding platforms and double tin dipping tanks, and shares the same one mold casting mechanism; when the first casting and welding platform performs the tin dipping operation, the second casting and welding platform performs the casting and welding operation; the two sets of casting and welding platforms are alternatively operated to improve the casting and welding efficiency; a material carrying vehicle is arranged to perform a reciprocating motion among four stations of a polar plate set input station, a first casting and welding platform tin dipping station, a second casting and welding platform tin dipping station and a polar plate set output station, so that the loading and the unloading of polar plate sets on the casting and welding platforms are realized; and two equipment are alternatively operated to greatly improve the casting and welding efficiency. The double-station full-automatic casting and welding machine needs no manual site operation, and is provided with a protective cover for largely reducing the bodily injury of operators or the environmental pollution caused by lead smoke.