The invention discloses an automatic casting machine for producing an aluminum piston blank, which is characterized by comprising a casting host machine, a casting receiving and casting quenching manipulator, and a pouring robot; the casting host machine comprises a lathe bed and a main framework; the main framework is installed at the upper end of the lathe bed, and a center core mechanism is installed in the lathe body; an outer die mechanism and a top die mechanism are installed on the main framework, the outer die mechanism operates opening and closing of left and right half outer dies; the top die mechanism operates the opening and closing between the top die and the outer die; the center core mechanism operates the lifting of the center core; the casting receiving and casting quenching manipulator comprises a big bracket and a three-axes association mechanism installed on the big bracket, an air pawl installed on the three-axes association mechanism; the air pawl is used for taking the casting piece from the casting host machine. The automatic casting machine has the beneficial effects of improving the production efficiency, reducing the worker labor intensity, and reducing the influence of artificial factors on the casting quality of the aluminum piston.