The invention relates to a posture-adaptive underwater high-speed towing hydrofoil device, belonging to the technical field of underwater towing. The device comprises two parts including an oblique tension wing and a horizontal wing, is in a U shape on the whole and is arranged in a left-right symmetrical manner; the oblique tension diversion wing sleeves an oblique tension wing tube and can freely rotate, so that the whole resistance of the device can be well reduced, the vortex-induced vibration is avoided, and the safety and the stability of the device are guaranteed; the horizontal diversion wing sleeves a horizontal swing tube; the angle of attack of a depth setting wing is adjusted by an angle fine adjustment nut. When a ship has a speed, a downward lift force is generated by the depth setting wing, so that the towing device is maintained to be at a certain depth of water; due to the left-right symmetrical arrangement, the horizontal wing is capable of automatically adjusting the posture, so that the horizontal state can be maintained. The device is simple in structure, convenient to operate, safe, reliable and high in practicality, and is suitable for a towing hydrofoil for the ship at high speed.