The invention discloses a synchronous wind tunnel testing device for aeroelasticity and wind pressure considering the aerodynamic interference effect, and is applied to the field of wind tunnel testing devices. The device comprises a testing bench fixed in a wind tunnel, and a testing unit arranged on the testing bench. According to the synchronous wind tunnel testing device for aeroelasticity andwind pressure considering the aerodynamic interference effect, a wind pressure test and a aeroelasticity test can be synchronously carried out, and the influence of model vibration on wind load is comprehensively reflected; the air inertial force in the model vibration is measured, so that the obtained result of the aerodynamic force actually caused by wind is more accurate; the simulation of a multi-building structure layout is realized in one testing device, and the aerodynamic interference effect factor existing in a building group is taken into consideration; and meanwhile, it is convenient to adjust the relative position of each building structure, namely the distance between every two buildings, and the included angle relative to the wind direction, so that the research on the influence of the position layout of different buildings on aeroelasticity characteristics and wind pressure characteristics in one testing device is achieved, and the more practical theoretical research support is provided for the technical field of aeroelasticity characteristics and wind pressure characteristics.