The invention discloses a novel double-pouring ladle mechanical arm for a gravity casting fluid feeding machine. The mechanical arm comprises a working arm, a first pouring ladle, a second pouring ladle driving mechanism and a second pouring ladle, wherein the first pouring ladle is fixedly connected with the left end of a sprocket shaft, and the second pouring ladle driving mechanism is fixedly connected with the right end of the sprocket shaft; the second pouring ladle driving mechanism comprises a shell, a servo motor, a pinion, a bull gear, a lead screw, a ball nut, a connecting plate, a front support and a rear support, and the second pouring ladle is fixedly connected with the right end of the connecting plate. The double-pouring ladle mechanical arm is novel and reasonable, simple in structure, and fast and stable in operation, and can be matched with a small-size melt furnace for use; the problem that the double-pouring ladle device of the mechanical arm is interfered with the melt furnace is solved, pouring at sprues with different distances in gravity casting is realized, the mechanical arm can be mounted on a five-rod fluid feeding machine for use, massive manpower is saved, the production cost is reduced, the production efficiency is improved, and the technical content is high.