The invention relates to an unpowered flight mechanism. The unpowered flight mechanism comprises a fuselage, wherein a nose is arranged at the front side of the fuselage, an empennage is arranged at the rear side of the fuselage, the left side and the right side of the fuselage are each provided with a wing, the nose is provided with a leading-in hole for allowing air to enter the fuselage, the fuselage is provided with a communicating hole communicating with the outside, a leading-out hole is formed in the rear side of the fuselage, and a flow guide channel used for enable the leading-in hole, the communicating hole and the leading-out hole to intercommunicate with each other is arranged inside the fuselage. For the unpowered flight mechanism, through the design of the flow guide channel,when the unpowered flight mechanism is ejected to the air and flies, air can enter the fuselage through the leading-in hole, by utilizing the design that the flow guide channel communicates with thecommunicating hole and the exporting hole, air can be diverted and leaves from the position above the fuselage and the tail end of the fuselage simultaneously, thus two different paths of airflow is formed, then the flight stability of the unpowered flight mechanism is stabilized, and the shaking probability of the fuselage is greatly reduced.