The present invention discloses a template matching parallel implementation method and apparatus by combining a large template graph, and belongs to the field of normalized correlation graph templatematching. The normalized correlation coefficient calculation module logical framework comprises a template image gray value summation module, a template gray value square summation module, a real-timegraph gray value summation module, a real-time graph gray value square summation module, a real-time graph template gray value product summation module, a subsequent calculation module, a real-time graph template gray value total buffer module, a real-time graph gray value total buffer module, a real-time graph gray value total square buffer module, and other modules. According to the technical scheme of the present invention, by adding the real-time graph gray value total buffer module, the real-time graph gray value square total buffer module and the real-time graph template gray value product total buffer module, and by controlling the number of parallel channels implemented by comparing the sizes of the template graphs in the process, control of the logic of the big template graph mode and the small template graph mode is respectively executed, so that the structure is realized to be no longer limited by the number of parallel channels and the resource utilization is improved.