A drink dispenser with a detachable fizz infuser, comprising a drink bottle, and further comprising a base, a main body, a main body support, a top cap, an exiting gas driving device, a gas exiting device, a gas transfer device, a gas inlet device, and a CO 2 cylinder, the main body is provided with an upper opening and a lower opening, one side is provided with a notch of the drink bottle, and the other side is provided with a compartment for the CO 2 cylinder; the top cap is pin-jointed with the upper opening of the main body, and a lower end of the main body is fixedly connected with the base; the main body support is arranged at an upper portion in the main body, the gas exiting device is arranged on the main body support, is opposite to the compartment, and is matched with the CO 2 cylinder; the exiting gas driving device is arranged on the top cap and is matched with the gas exiting device; the gas transfer device is arranged on the main body support and is opposite to the notch; the gas inlet device is arranged on the main body support, a bottle neck of the drink bottle is detachably connected with the gas inlet device, the gas inlet device is communicated with and detachably matched with the gas transfer device, and the gas transfer device is communicated with the gas exiting device, characterized in that the gas inlet device comprises an outer cover of the lower opening, a lower cap, a chucking lug block, a gas inlet cap, a safety valve core, a safety spring, a plug screw, an exhaust valve core, an exhaust spring, an exhaust fixing block, an exhaust pull ring, a check valve core, a rubber sleeve, a filter screen, a nozzle bar, a pressure spring, a seal ring and a bottle adapter, a top plate of the outer cover is provided with a center hole and a guide hole, a circular wall is provided with two embedding slots; the outer cover is internally provided with two pivoting seats; and the chucking lug block is embedded with the embedded slots; wherein the gas inlet cap is provided with a valve core cavity communicated with the gas inlet cap, a top of the valve core cavity is provided with a gas inlet interface; a safety pressure release cavity is communicated with the gas inlet cap; an axis of the safety pressure release cavity is perpendicular to that of the valve core cavity; two exhaust cavities are communicated with the gas inlet cap; the exhaust fixing block is provided with a compartment having two lower openings, a guide rod hole is communicated with the compartment; the gas inlet cap is arranged in the outer cover, the center hole of the outer cover is opposite to the gas inlet interface, the guide hole of the outer cover is opposite to the exhaust cavity on the gas inlet cap, the chucking lug block is embedded with the embedding slot, a screw passes through the chucking lug block to screw with the gas inlet cap, the gas inlet cap and the outer cover are fixedly connected together; the safety valve core is arranged in the safety pressure release cavity; one end of the safety spring is matched with the safety valve core, while the other end thereof is matched with the plug screw and the plug screw is screwed with the safety pressure release cavity; the exhaust valve core is arranged in the exhaust cavity, the exhaust spring is sheathed on a valve rod of the exhaust valve core, the exhaust cavity is inserted in the compartment of the exhaust fixing block, the exhaust fixing block is fixedly connected with the gas inlet cap, the valve rod passes through the guide rod hole in the exhaust fixing block; a pivoting end of the exhaust pull ring is pivoted with the pivoting seat in the outer cover, the exhaust pull ring is matched with the guide hole in the outer cover in a rotating way; and an upper end of the valve rod is pivoted with the exhaust pull ring; the filter screen is fit with a top plate of the valve core cavity, the rubber sleeve is sheathed on the check valve core, the check valve core is embedded in a cavity body of the head of the nozzle bar, the head of the nozzle bar is screwed with the valve core cavity; the seal ring is pin-jointed with the gas inlet cap, the bottle adapter is fixedly connected with the gas inlet cap and compresses a circular edge of the seal ring; a rod portion of the nozzle bar passes through the sealing ring, the bottle adapter and the lower cap to extend out; one end of the pressure spring is matched with the gas inlet cap, while the other end thereof is matched with the seal ring, and the drink bottle is detachably matched with bottle adapter.