The invention provides an aluminium alloy automobile instrument panel bracket and a manufacturing process thereof and belongs to the field of aluminium profile processing. The aluminium alloy automobile instrument panel bracket is characterized in that, according to each piece of equipment arranged in an aluminium alloy automobile instrument panel, a bracket and an instrument panel reinforcing beam cross beam of each piece of equipment are connected with each other. The manufacturing process comprises the steps of extruding an alloy according to the structure and the shape of the aluminium alloy automobile instrument panel bracket after the alloy is cast; according to the sections of extruded profiles, cooling the extruded profiles; and combining the cooled profiles according to the structure of the aluminium alloy automobile instrument panel bracket, wherein a brake pedal protective bracket assembly is connected with an instrument panel reinforcing beam cross beam in an inserted manner; and the rest parts are fixed by being spliced and welded. According to the aluminium alloy automobile instrument panel bracket, the most appropriate section and alloy states can be adopted in different positions according to design demands so as to achieve an optimal weight loss effect; in addition, the development cost of desired molds and tools is low, the development period of the desired molds and the desired tools is short; and the research and development efficiency in the earlier stage is greatly enhanced.