The invention discloses a gear pump shell made from an iron aluminum composite material and a manufacturing method thereof and relates to the technical field of a gear pump. The gear pump shell comprises a main body; a cavity for accommodating a driving gear and a driven gear is arranged in the main body; an oil inlet and an oil outlet which are communicated with the cavity are respectively formed in the two sides of the main body; the main body has a double-layer structure and comprises an outer wall and an inner wall; a hollow interlayer is arranged between the outer wall and the inner wall; and a plurality of spheroid graphite cast iron frameworks and a high-strength aluminum alloy filler are filled in the hollow interlayer. The product disclosed by the invention has the advantages of high strength, excellent pressure resistance, light weight, excellent radiating effect, strong plasticity, and the like.