Deflector plate capable of improving backflow characteristic

The invention belongs to the technical field of aircraft take-off control, and particularly relates to a bias plate capable of improving the backflow characteristic. When the bias flow plate (1) is in an open state, a plurality of bosses (3) extending in the width direction are formed on the side, facing an airplane, of the bias flow plate (1), the boss (3) located at the highest position is located on the lower edge of tail jet flow jetted by an airplane tail jet pipe in the height direction, and a strip-shaped groove used for guiding airflow to flow back is formed between every two adjacent bosses (3). The open state of the bias plate (1) means that the bias plate (1) is placed on the ship platform (2) from a horizontal state to a vertical state forming a certain angle with the ship platform (2), and is placed behind an aircraft to be takeoff, so that the aircraft is boosted to take off by means of the counter-acting force of jet flow at the tail of the aircraft. Backflow can be effectively blocked, and the