Mechanical scissor jack with warning function

The utility model discloses a mechanical scissor jack with the warning function. A warning air bag is arranged between an upper arm and a lower arm. One end of the warning air bag is fixed to the hinged end of the upper arm, and the other end of the warning air bag is fixedly arranged at the hinged end of the lower arm. The warning air bag is provided with a warning through hole. A warning device is arranged in the warning through hole. The warning device comprises a warning whistle matched with the warning through hole. Ascending and descending of a top tray can be achieved by shaking a Z-shaped rocker. During ascending and descending, the size of the warning air bag can be changed due to the linear distance between the hinged ends of the upper arm and the lower arm, airflow produced when the size of the warning air bag is changed can pass through the warning whistle in the warning through hole, the warning whistle can make a sound to remind workers to enter a safe position.