The utility model discloses a connecting structure of a steel support and a steel enclosing purlin in a subway station enclosure structure, which is characterized in that a steel hanging piece is independently arranged, the steel hanging piece comprises a vertical hanging plate, a hook is formed at the top end of the vertical hanging plate towards the back, and a horizontal bearing plate is fixedly connected to the bottom of the vertical hanging plate towards the front by using a reinforcing rib; the steel hanging pieces are hooked on the steel enclosing purlins through the hooks, and the steel hanging pieces are adjusted to the set positions of the steel enclosing purlins; the end of the steel support is erected on the horizontal bearing plate of the steel hanging plate to achieve connection between the steel support and the steel enclosing purlin. According to the utility model, the connecting construction quality of the steel support and the steel enclosing purlin can be ensured, and the turnover utilization rate of the steel support is improved.