The invention discloses a molten aluminum quantitative charging device for aluminum rod production. The device comprises a melting furnace; the top of the melting furnace fixedly communicates with a feed port and a transparent charging pipe; a first valve is mounted in the charging pipe; a pushing cylinder is fixedly mounted in the charging pipe; the pushing cylinder is positioned above the firstvalve; scales are fixedly arranged on the pipe wall of the charging pipe; the scales are positioned between the first valve and the pushing cylinder; a charging port is fixedly connected to the centerof the lower end of the pushing cylinder; a piston is slidingly connected into the pushing cylinder; a push rod is fixedly connected to the center of the end, far from the charging port, of the piston; the other end of the push rod penetrates through the pushing cylinder, and outwards extends; the push rod is positioned in the charging pipe; and a discharge port is mounted on the vertical side wall of the side, near the bottom, of the melting furnace. The device controls the quantity of additives more precisely, is lower in cost, and improves the quality of aluminum rod products.