Laser lock-in imaging technology is a method for obtaining target image from very powerful background lights based on the combination of phase discrimination of weak signal detection with the optical, which is applied in industrial measurement. A lock-in imaging based on modulated white LED is put forward based on the phase technology of laser lock-in imaging. The white LED controlled by voltage modulation is used to illuminate interested target area where there are strong lights, and a color CCD image sensor is employed to take image synchronically. Then we adopt phase discrimination to handle the component of image’s RGB respectively. The experimental results show that lock-in image based on white LED is capable of getting image clearly from very powerful background light, and expands the range of application. The video monitoring, industrial measurements and other fields will have broad application and practical value.