The invention belongs to the technical field of automobile accessories, in particular to an integrally-cast hollow aluminum alloy front subframe, including an aluminum alloy front subframe with a hollow interior structure and consisting of a front cross beam, a rear cross member, left and right longitudinal beams, wherein vehicle body mounting holes are formed on the top right side of the right longitudinal beam and on the left and right sides of the rear cross beam; the left and right sides of the front surface of the front cross beam and the left and right sides of the front surface of the rear cross beam are provided with weight reduction holes, a suspension mount part is arranged at the center position of the front surface of the left longitudinal beam and the center position of the front surface of the right longitudinal beam, as the density of the cast aluminum material is only 1/3 of the of the steel material, the numb of the parts is greatly reduce compared with the traditionalsteel subframe, the strength and the performance of the product are guaranteed, the complexity of the process is reduce, the weight of the product is reduced, the oil consumption is reduced, the integral casting is adopted, the accuracy of the assembly dimension is improved, and the difficulty of recovery is reduced.