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Multi-core technology is the main method now to improve chip performance. Difference from the traditional LPR (license plate recognition) system based on PC and DSP, a multi-core processor is built using SOPC Builder to realize license plate recognition based on FPGA. In the multi-core processor, with three main Nios II soft cores to process license plate location, character feature extraction and recognition, we add hardware accelerators to process image strengthening, edge detection and mathematical morphology processing such as corrosion and expansion as coprocessors. On the basis of CQ router, NOC is structured to implement on-chip communication between multi cores. In addition, data-driven module is designed to ensure rapid and parallel communication between the router and multi-core processors. The entire system achieves license plate recognition on the Altera Cyclone IV FPGA. The on-chip system design features hardware design flexibility, scalability, etc., can effectively reduce the difficulty of system hardware and software design, shorten development cycles and improve design reliability.