In order to achieve accurate measurement of laser power at different wavelengths and directions in multi -parameter laser warning, an optical power detection circuit was designed. This circuit mainly consists of two parts: a photoelectric detection module and an A/D acquisition module. The photoelectric detection module consists of a photodiode and an operational amplifier OPA2846, while the A/D acquisition module is composed of an AD9220 analog-to -digital conversion circuit and an FPGA interface circuit. The incoming continuous laser is converted into a voltage signal through the photoelectric detection module. The voltage signal is converted into a digital signal through the A/D acquisition module and transmitted to the FPGA through an interface circuit. The FPGA then corrects and displays the optical power based on the wavelength and direction of the incoming laser obtained by the laser warning system, and quantitatively marks it with an optical power meter to meet the linear response range of the photodiode, It can be concluded that there is a linear relationship between the optical power and the collected voltage value. Under the condition of not using an external optical attenuator, this circuit achieves the measurement of optical power at different incident angles in the spectral range of 400 nm ~ 1 700 nm and the power range of 0~60 mW. Compared with the results measured by the power meter, the error is less than 0.5 mW.