In order to clarify the buffeting performance of the joint system composed of free-standing steel pylon and tower crane as well as the effect of tower crane on the buffeting response of steel pylon, wind tunnel tests of aeroelastic model of the joint system and free-standing pylon are designed and carried out. Modal parameters and buffeting performance under different wind speeds and wind yaw angles of the two systems are obtained. The effects of wind speed and wind yaw angle on the two systems are summaried and compared, and the vibration responses of the joint system between tower crane and steel pylon in both longitudinal direction and lateral direction are compared in the end. The results show that the mean value of wind-induced buffeting displacement of steel pylon and tower crane can be approximately treated as a quadratic function of wind speed, while the standard deviation of displacement oscillates back and forth with the increase of wind speeds, and the existence of tower crane can decrease the mean value and standard deviation of wind-induced buffeting displacement of steel pylon significantly. Wind yaw angle has obvious effects on the wind-induced response of steel pylon and tower crane. The vibration response of the tower crane is much larger than that of pylon in longitudinal direction of bridge, but it is a little smaller in lateral direction due to the local vibration of tower crane.