The invention relates to an aluminum alloy suspending quantitative casting control method. The method is achieved by adopting a control device which comprises a crucible, a main electromagnetic pump, a liquid lifting pipe, a liquid outlet, a laser range finder, a first auxiliary electromagnetic pump and a second auxiliary electromagnetic pump; aluminum liquid sequentially flows through the first auxiliary electromagnetic pump, the second auxiliary electromagnetic pump, the main electromagnetic pump, the liquid lifting pipe and the liquid outlet; the first auxiliary electromagnetic pump is parallel to the second auxiliary electromagnetic pump, and an included angle of 30-60 degrees is formed between the first auxiliary electromagnetic pump and an aluminum liquid conveying pipeline and formed between the second auxiliary electromagnetic pump and the aluminum liquid conveying pipeline; the magnetic induction intensity B of the first auxiliary electromagnetic pump and the magnetic induction intensity B of the second auxiliary electromagnetic pump are same in size and direction; the metal liquid in a magnetic gap of the first auxiliary electromagnetic pump and the metal liquid in a magnetic gap of the second auxiliary electromagnetic pump are same in length; a current of the first auxiliary electromagnetic pump and a current of the second auxiliary electromagnetic pump are same in size and opposite in direction, therefore, the aluminum liquid can be stirred in the direction of being perpendicular to the flowing direction, gas and residues which are mixed in the aluminum liquid can be relatively uniform, and then the quantitative precision is improved.