The invention discloses an idling shutdown control method and system and a hybrid electric vehicle. The control method includes the steps that after an engine shutdown command is received, an engine and a drive motor are controlled to stop working, and the rotating speed of the engine starts to be reduced; the rotating speed of the engine is obtained, whether the rotating speed of the engine is smaller than or equal to the first rotating speed or not is judged, and if the rotating speed of the engine is smaller than or equal to the first rotating speed, the drive motor is controlled to output torque to the engine, and the rotating speed of the engine is kept at the second rotating speed; whether an engine start command is received or not is judged, and if the engine start command is received, the engine is controlled to be re-started; and if the engine start command is not received, the rotating speed of the engine is kept at the second rotating speed, and the step that whether the engine start command is received or not is judged is executed again. By the adoption of the control method, the re-start time of the engine in an idling shutdown state is shortened.