The invention belongs to the field of airplane design and relates to an airplane high lift device with single slotted flaps for increasing the lift force of an airplane to take off and land. The high lift device comprises flaps, a main wing rear spar fixed link, a flap front spar fixed link, a flap rear spar fixed link, a linkage rod, a lower baffle plate, a stripper rubber and an actuator cylinder. The airplane high lift device with single slotted flaps, provided by the invention, can be used for improving the high lift capacity of the airplane and increasing the maximum lift coefficient of the airplane by 8%-15% and the loading capacity by 8%-15%. A movement mechanism provided by the invention has smaller windward area, which can decrease the cruising resistance of the airplane by 0.5%-1.5% and the fuel oil consumption by 0.5%-1.5%. According to the invention, the lower baffle plate in a flap cabin can properly decrease the noise generated by the airplane by 2-5dB during the taking off and landing of the airplane, and thus the airplane is more environmentally-friendly. The lower baffle plate in the flap cabin can be used for increasing the lift-drag ratio of the airplane by 3%-6% during the taking off of the airplane, so that the airplane is safer with greater rate of climb.