The invention provides an aluminum alloy auxiliary vehicle frame structure. The aluminum alloy auxiliary vehicle frame structure comprises front supporting seats (10), a front crossbeam (20), longitudinal beams (30), reinforcing ribs (40), left and right suspension swing arm mounting supporting seats (50), auxiliary vehicle frame rear supporting seats (60) and a rear crossbeam (70). The front crossbeam (20), the rear crossbeam (70), the longitudinal beams (30) and the reinforcing ribs (40) are connected. The auxiliary vehicle frame front supporting seats (10) are connected with the longitudinal beams (30) or the front crossbeam (20). The suspension swing arm mounting supporting seats (50) and the longitudinal beams (30) are integrated. The auxiliary vehicle frame rear supporting seats (60), the rear crossbeam (70) and the reinforcing ribs are integrated. The aluminum alloy auxiliary vehicle frame structure is simple in structure and convenient to mount, and other parts are arranged onan auxiliary vehicle frame advantageously.