A three-dimensional shape measurement method for large-area and high-reflection objects is proposed. Based on the theory of two-color reflection model, the diffuse reflection components of the fringe image collected by the camera are extracted. The reflection component of the image is separated by the improved reflection component separation algorithm. And the improved seed search algorithm is used to repair the image hollow caused by the reflection component separation. The three-step phase shift and quality guide algorithm are used to obtain the continuous phase. And the height information of the object is obtained by the phase height mapping relationship calibrated by the system.. The experimental results show that the measured error of this method is about 0.23 mm, which can eliminate 93%-97% of the number of high-light pixels, effectively overcomes the reflected light interference, and has good robustness for large-area reflected light.