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A three phase phase-locked loop (PPL) based on LabVIEW FPGA structure is proposed, to make up the shortages of real-time human-machine interaction based on traditional FPGA model. The solution is designed on sbRIO-9631 platform, use LabVIEW program to control FPGA logic. Adopt three pipelines to implement the improved synchronous transform in FPGA program, and besides, use FIFO to translate acquired signal and output-phase from FPGA to PC. At last, achieve the PLL performance analysis, real-time display and PI parameters setting functions in PC. Experimental results show that the PLL has a phase-locked time with tow cycles and a phase-locked lag with 0.03 rad, it not only has a good phase-locked precision, but also has a well real-time human-machine interaction.