Disclosed is a telescopic wing mechanism with slotted wing flaps and a continuously variable wingspan. The telescopic wing mechanism is composed of an inner section main wing (1A); an outer section main wing (3A); a middle section main wing (2A) nested between the inner section main wing and the outer section main wing; inner, middle and outer wing flaps (1B, 2B, 3B) that are connected to the inner section main wing, the middle section main wing and the outer section main wing respectively; first and second linear electric motors (10, 11), which are used for driving the inner section main wing, the middle section main wing and the outer section main wing to move in a spanwise direction respectively; and inner, middle and outer section wing flap control steering engines (23, 24, 25), wherein one end of a front beam and a rear beam of the inner section wing is connected to a fuselage, and the other end of the front beam and the rear beam of the inner section wing is inserted into a front beam and a rear beam of the middle section wing. A front beam and a rear beam of the outer section wing are inserted into the front beam and the rear beam of the middle section wing. The middle section wing flap is nested between the inner section wing flap and the outer section wing flap. Front and rear beams of each section of wing are arranged in parallel in the spanwise direction, and the main wings of the three sections of wings carry out telescopic motion in the direction of the front and rear beams, and also drive the three sections of wing flaps to achieve telescopic motion. Telescopic positioning is achieved by means of a locking mechanism in the linear electric motor. The wing flaps are controlled to be folded and unfolded by means of the three steering engines. The aerodynamic load of the wings is transferred from the skin to the beam by means of ribs.
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