The utility model provides an aluminium piston autonomic casting machine for a truck, belonging to an autonomic casting device, comprising a lathe bed, a rotating shaft on the lathe bed is arranged with a supporting stand, which is fixed on a worktable, the worktable has an external mold and an internal mold, udder the worktable a central core and a tiliting device are provided, on the worktable a backform device is provided, the casting machine, with the technique of an underdraft core, matches the progressive solidification for the aluminium piston, rises the quality of a roughcast of the aluminium piston, greatly reduces the weight ratio between a casting head and the piston roughcast, thereby reducing the weight ratio from the former at least 0.6 to 1 to 0.3 to 1, greatly increasing the technical production ratio, eliminating the shrink head at the two sides and a subsidy, being convenient for future mechanical workout, realizing the automated process of casting and producing the aluminium piston, except pouring, putting a wear resistant cast iron ring, and putting a salt core, having high productivity efficiency, reducing labour intensity, compared with imported casting machines, the utility model has simple and reasonable operation, simple mould, and low production cost.