Dual-frequency fringe projection method is a common phase unwrapping algorithm. Due to the influence of factors such as random noise and camera defocusing, the fringe order calculation results of the dual-frequency phase unwrapping algorithm often have errors, leading to phase errors. In order to solve this problem, this paper proposes a phase unwrapping correction algorithm to correct the high-frequency fringe orders. First, the entire fringe region is divided into two masks according to the value range of high-frequency truncated phase. Then, the connected components of these two masks are marked, respectively. In addition, the fringe orders that appear most frequently in each marked region are counted, whose values are assigned to all pixels in the current marked region. Finally, the absolute phase is obtained by unwrapping the corrected fringe orders. The simulation and actual experimental results show that the proposed method can be used to effectively eliminate the phase unwrapping errors in the dual-frequency fringe projection method.