A bubble liquid bottle includes a bottle body, a pad covering a mouth of the bottle body, a straw connected to a communication opening of the pad and inserted into the bottle body, and a head. The head is disposed on the mouth and includes a main body having outlet, inlet, and communication channels, a handle, and a pressure-relief device disposed in the communication channel and including a stopper, an elastic member for driving the stopper to block communication between the outlet channel and the communication opening, and a ring located above the outlet channel and sleeving the stopper. The handle is pivoted to the main body and inserted into the stopper for moving the stopper upward. When an internal pressure of the bottle body is greater than a predetermined value, the stopper is moved upward by the internal pressure to make the outlet channel communicated with the communication opening.