Damage-preventing automatic balloon inflating device

The invention discloses a damage-preventing automatic balloon inflating device which comprises an inflating shell, wherein a clamping device is arranged in the inflating shell and comprises a first clamping groove opened upward. An air inlet communicates to the lower side of the first clamping groove, an air inlet pipeline that stretches left and right communicates to the lower side of the air inlet, and the air inlet pipeline penetrates the left and right end surfaces of the inflating shell. The device can clamp the balloon to test the maximum expansion degree of the balloon, and reduces theheight of a lifting bar, so that an inflating pump stops working automatically before the balloon reaches the maximum expansion volume during inflation next time and the balloon is prevented from being inflated excessively to damage. Meanwhile, the expansion volume of the balloon reaches the maximum degree and is consistent, and at the same time, the height of the lifting bar can be adjusted automatically along with mater