The invention provides a high-frequency flapping-wing bionic insect aircraft with controllable passive torsion. The high-frequency flapping-wing bionic insect aircraft comprises an aircraft body framework, and a hollow cup power motor, a crank rocker transmission mechanism, a speed reduction gear group, bionic flapping wings, a controllable passive torsion mechanism and a ball bearing group which are arranged on the aircraft body framework, wherein the crank rocker transmission mechanism converts rotation of an output shaft of the hollow cup power motor into reciprocating flapping motion of the two flapping wings, to simulate flying of insects; the speed reduction gear group is used for lowering the rotating speed of the output shaft of the hollow cup power motor, so that the flapping action of the flapping wings finally keeps in a range; the controllable passive torsion mechanism ensures that the flapping wings can be twisted around rotating shafts, to generate uplifting force; meanwhile, repelling force between a limiter and an electromagnet makes the flapping wings return to the vertical positions. By the adoption of the ball bearing group, the crank rocker transmission mechanism and the controllable passive torsion mechanism, the aims of greatly reducing the transmission friction and effectively converting the power into lift force of the aircraft are fulfilled.