Treadmill folding device having locking function and method for using the same

A treadmill folding device having a locking function, comprising a treadmill deck, a first upright pole, a control panel and a first lockable telescopic mechanism, the control panel being mounted to an upper end of the first upright pole, a lower end of the first upright pole being movably connected to a side of the treadmill deck, the first upright pole being rotatable forward and backward relative to the treadmill deck, the first lockable telescopic mechanism being connected between a middle portion of the first upright pole and the side of the treadmill deck, wherein the first upright pole, the treadmill deck and the first lockable telescopic mechanism form a triangular area when the first lockable telescopic mechanism is in an extended state;

• wherein the first upright pole is parallel to or about parallel to the treadmill deck when the first lockable telescopic mechanism is in a retracted state.