The invention relates to a concrete strip-shaped foundation formwork automatic mounting machine for building of a steel structure bridge. The concrete strip-shaped foundation formwork automatic mounting machine comprises a bottom plate mounted on a bearing movable vehicle. A clamping conveying device and a quantity-limiting feeding device are mounted on the bottom plate sequentially from front toback. The problems that in the manual fixing and mounting process of a reinforced concrete strip-shaped foundation formwork support in the prior art, formworks need to be conveyed to the work positions manually through existing large conveying equipment in a unified mode, the formworks of different specifications are conveyed to the corresponding positions manually through existing hoisting equipment according to the different mounting positions, and energy consumption of the large conveying equipment is large; the formworks need to be fixed correspondingly in the manual conveying process of the formworks, operation is complex, and manual fixing of the formworks is unstable; and in the manual fixing and mounting process of the reinforced concrete strip-shaped foundation formwork support, labor intensity is large, stability is poor, and the working efficiency is low can be solved, the mechanical conveying and mounting function of the reinforced concrete strip-shaped foundation formworksupport can be achieved.