The flexible solar cell wing has been successfully applied in China's Space Station for the first time. It is one of the most complex and difficult mechanical and electrical products in the space station system. As a key component of the flexible solar cell wing system，the mechanism is used to realize the protection of the flexible solar cell wings in the ascent stage andunlock andrelease the flexible solar cell wings in the orbital section. Therefore，the success of the space mission depends heavily on the proper functioning of the restraint release mechanism. Based on the task ，this paper introduces the structure、principle、design、simulation and application in orbit ，and analyzes the technical characteristics and key technologies. The ground verification and in-orbit flight have verified the correctness and rationality of the design for the restraint release mechanism，and provided a novel and reliable solution for the multipoint and large-area repeatable compression and unlocking for the Chinese spacecraft.