The invention discloses an emergency safety landing device for a bridge detection unmanned aerial vehicle, and relates to the technical field of unmanned aerial vehicles. An emergency safety landing device for a bridge detection UAV, comprising a body, a controller and a pressure sensor are arranged on the body, a power supply is arranged inside the body, a connecting rod is arranged at the bottom of the body, a support seat is arranged inside the first housing, and a motor is arranged on the support seat , a gear is set on the output shaft of the motor, a rack is set on one side of the gear, a first through hole is set on the bottom end of the first housing, a second through hole is set on the top wall of the second shell, a pressing plate is set on the bottom end of the rack, and the pressing plate A connecting ring is provided, a groove is provided on the outer wall of the second housing, a support bar is provided in the groove, a round hole is provided on the adjusting rod, a gap is provided at the bottom of the second housing, a supporting plate is provided at the bottom of the adjusting rod, and a buffer is provided at the bottom of the supporting board. The beneficial effect of the present invention is that: the present invention can safely land on the water surface when the UAV detects a bridge failure, thereby effectively protecting the UAV.