The invention discloses a servo aluminum casting machine. The servo aluminum casting machine comprises a case. A liquid filling box is arranged at the upper end of the case. The liquid filling box is connected with a main oil cylinder. The lower end of the main oil cylinder is connected with a sliding block. A melting cup is arranged at the lower portion of the case. An injection head is arranged below the melting cup. A middle plate is arranged on one side of the melting cup. The main oil cylinder is arranged on the upper side of the middle plate, and a demolding cylinder is arranged on the lower side of the middle plate. The right side of the middle plate is movably connected with a mold feeding cylinder. The liquid filling box is further connected with a piston type accumulator. By means of the manner and the servo aluminum casting machine, the work efficiency can be improved, running is stable, the service life is prolonged, the phenomenon of oil leakage is avoided, and high efficiency and energy saving are achieved.