Installing an odd number of Siberian snakes at equal azimuth intervals in a circular collider is a common scheme for obtaining longitudinally polarized beam collisions. In this paper, the solenoid Siberian snake is selected as the device to preserve beam polarization in the Super Tau-Charm Facility according to its characteristics. The paper introduces in detail how to combine particle swarm optimization algorithm with decoupling and optical matching problem of solenoid snake to design it quickly and optimally, and presents the design results. The results show that the optimization design of solenoid snake based on particle swarm optimization algorithm is effective and efficient.