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Aiming at the problems of large spot center extraction error, poor Angle measurement accuracy and low resolution of traditional two-dimensional laser warning system, a high-precision wide-band laser warning system based on FPGA and InGaAs focal plane array detector is designed, and the traditional otsu(maximum inter-class variance method) threshold segmentation algorithm is derived and optimized. Based on the improved algorithm, the center coordinates of spot are extracted and the parameters such as azimuth Angle and pitch Angle are calculated by FPGA, and the results are transmitted to the top computer for real-time monitoring. The experimental results show that compared with the traditional threshold segmentation algorithm, the improved otsu algorithm makes the spot center extraction accuracy reach 0.06 pixels, the average Angle measurement error of the improved laser alarm system is 0.03°, and the Angle resolution reaches 0.05°. The experimental results show that the binocular high precision and wide band laser warning system meets the requirements of practical application, improves the angular resolution and accuracy of the system measurement, and has certain significance for the work in the field of photoelectric detection and laser warning.