The invention discloses a bridge crack recognition device based on strain induction and a use method of the device. The device includes a fixed shell, a first fixed piece, a strain sensor, a thread rod, a second fixed piece, a fixing nut, a fan, a first block, a fixed plate, a threaded hole, a damping shell, a second block, a spring cushion, a vent hole, and a top plate. In the device, the strainsensor is arranged inside the fixed shell, the vent hole and the fan are arranged on the fixed shell, the spring cushion is disposed on the bottom of the damping shell, so that the device not only avoids direct irradiation on the strain sensor by sunlight but also brings convenience to heat dissipation, so that the recognition device is prolonged in service life and can reduce damage on the recognition device due to vibration of an unmanned aerial vehicle as most as possible.