The invention discloses a building aluminum alloy template combination system. The system includes standard templates and installment templates, wherein the standard templates and the installment templates are assembled together, and installment side plates and installment face plates are integrally stretched for molding; standard side plates and the installment side plates are installed togetherthrough bolts, the end faces of standard end plates and installment end plates are aligned, and each installment face plate is provided with multiple installment screw holes. According to the system,through the arrangement rule of the template system, the standard templates with a unified specification are used as many as possible when being arranged, remaining space is filled with a small numberof the installment templates, and the production efficiency and site installation efficiency of the complete set of aluminum template system and the repeated recycling utilization of the templates are improved to a large extent; moreover, only the installment templates are provided with the screw holes, trepanning damage to the standard templates can be eliminated, and the repeated utilization ofthe complete set of templates is further improved.