Abstract: In this paper,Aiming at the problems of low resolution and low Angle range of field of view, a binocular image sensor is proposed to realize laser alarm. The binocular imaging system is used to measure the wavelength and two-dimensional direction Angle of the incoming laser respectively. The optical system is mainly composed of grating, lens group and two COMS image sensors. Based on the grating diffraction principle, binocular detection is carried out to improve the angular resolution of measurement. The wavelength of the incoming laser is obtained by measuring the pixel distance of the diffraction spot of two adjacent levels on CMOS_1, and the two-dimensional direction Angle of the incoming laser is obtained by measuring the center position of the spot of the incident laser in the CMOS_2 image sensor. The principle of the method is explained by theoretical simulation analysis, the measurement formula of two-dimensional directional Angle and wavelength is derived, the parameters of optical components are determined, and the measurement feasibility is verified by experiments. The experimental results show that the wavelength resolution is better than 6nm, the Angle resolution is better than 0.1°, and the field Angle is ±50°.The accuracy of angle measurement is 0.1 °.