A gas guide tube assembly (200), a liquid storage device (10), a humidifier, and a ventilator. The gas guide tube assembly (200) comprises: a gas outlet guiding tube (210) having a gas inlet port (212) and a gas outlet port (214)； and a guide tube (220) having a communication port (222) that communicates with the gas inlet port (212) of the gas outlet guiding tube (210) and a plurality of gas reflux ports (224, 226) that communicate with the communication port (222). The gas guide tube assembly (200), when in use, is disposed in a liquid storage cavity (120) of the humidifier, and the gas outlet port (214) of the gas outlet guiding tube (210) of the gas guide tube assembly (200) communicates with a gas outlet (124) of the liquid storage cavity (120). The present invention can solve to a certain extent a problem of water inhalation into the user due to overflow from the gas outlet (124).
