This article expounds the importance of satellite solar wing mechanism among satellite products. On the basis of the reliability research situation of satellite solar wing mechanism, this article provides an analysis method based on Reliability safety coefficient for satellite solar wing mechanism Expanding movement. First, the reliability safety coefficient is introduced and derived; Second, using the parameters of a satellite solar wing mechanism to analyze and calculate. Finally, the result, compared with the method formulated by GJB, certifies the rationality and feasibility of proposed method, and provides a useful reference for reliability design of satellite solar wing mechanism.