A separable beverage freshness preserver, comprising a gas outlet assembly and a sealing assembly connected with the gas outlet assembly, characterized in that the sealing assembly comprises a liquid guiding assembly and a bottle stopper assembly connected with the liquid guiding assembly; the liquid guiding assembly comprises a cock and a liquid dispensing pipe connected with the cock; and the liquid dispensing pipe is detachably connected with the cock; the cock is provided with a liquid dispensing passage, and one end of the liquid dispensing pipe is detachably arranged in the liquid dispensing passage; a liquid outlet passage is arranged in the cock, and the liquid dispensing passage communicates with the liquid outlet passage; and the cock is further provided with a gas guiding passage, a gas inlet passage and a gas guiding hole communicating with the gas guiding passage, and a lower end of the gas guiding passage is connected with the gas inlet passage; the bottle stopper assembly comprises a bottle stopper main body, a gas inlet duct and a liquid outlet duct which are connected with bottom of the bottle stopper main body, and a connector arranged inside the bottle stopper main body; the bottle stopper main body comprises a lower bottle stopper, a middle portion of the lower bottle stopper is of a plate body structure, and a gas inlet hole and a liquid outlet hole are arranged at the middle portion of the lower bottle stopper and respectively and correspondingly communicate with the gas inlet duct and the liquid outlet duct; the connector comprises a gas passing pipe and a liquid passing pipe, and upper ends of the gas passing pipe and the liquid passing pipe are respectively and detachably connected with bottoms of the gas inlet passage and the liquid outlet passage of the liquid guiding assembly; upper ends of the gas inlet duct and the liquid outlet duct are correspondingly jointed with the gas passing pipe and the liquid passing pipe of the connector 34 via the gas inlet hole and the liquid outlet hole; and a sealing device is arranged on surfaces, respectively connected with the gas inlet passage and the liquid outlet passage, of the gas passing pipe and the liquid passing pipe; the cock arranged to drive the connector to rotate, and rotation of the connector enables the gas passing pipe and the liquid passing pipe to be correspondingly jointed with the gas inlet hole and the liquid outlet hole and to seal up the gas inlet hole and the liquid outlet hole so as to achieve an effect of opening and closing the gas inlet hole and the liquid outlet hole when the liquid guiding assembly is rotated. the liquid guiding assembly comprises a cock and a liquid dispensing pipe connected with the cock; and the liquid dispensing pipe is detachably connected with the cock; the cock is provided with a liquid dispensing passage, and one end of the liquid dispensing pipe is detachably arranged in the liquid dispensing passage; a liquid outlet passage is arranged in the cock, and the liquid dispensing passage communicates with the liquid outlet passage; and the cock is further provided with a gas guiding passage, a gas inlet passage and a gas guiding hole communicating with the gas guiding passage, and a lower end of the gas guiding passage is connected with the gas inlet passage; the bottle stopper assembly comprises a bottle stopper main body, a gas inlet duct and a liquid outlet duct which are connected with bottom of the bottle stopper main body, and a connector arranged inside the bottle stopper main body; the bottle stopper main body comprises a lower bottle stopper, a middle portion of the lower bottle stopper is of a plate body structure, and a gas inlet hole and a liquid outlet hole are arranged at the middle portion of the lower bottle stopper and respectively and correspondingly communicate with the gas inlet duct and the liquid outlet duct; the connector comprises a gas passing pipe and a liquid passing pipe, and upper ends of the gas passing pipe and the liquid passing pipe are respectively and detachably connected with bottoms of the gas inlet passage and the liquid outlet passage of the liquid guiding assembly; upper ends of the gas inlet duct and the liquid outlet duct are correspondingly jointed with the gas passing pipe and the liquid passing pipe of the connector 34 via the gas inlet hole and the liquid outlet hole; and a sealing device is arranged on surfaces, respectively connected with the gas inlet passage and the liquid outlet passage, of the gas passing pipe and the liquid passing pipe; the cock arranged to drive the connector to rotate, and rotation of the connector enables the gas passing pipe and the liquid passing pipe to be correspondingly jointed with the gas inlet hole and the liquid outlet hole and to seal up the gas inlet hole and the liquid outlet hole so as to achieve an effect of opening and closing the gas inlet hole and the liquid outlet hole when the liquid guiding assembly is rotated.