To provide a beer server system improved in cleaning power of a beer hose, and a method of cleaning the beer hose.SOLUTION: A beer hose 7 is configured from polyvinylidene fluoride in at least an inner surface, a cleaning adaptor 20 comprises a cleaning water bottle 21 that stores cleaning water and a removable bottle head 23 at a water sucking part 22 of the cleaning water provided on the cleaning water bottle 21, and the bottle head 23 configures a dispense head 6 in a connectable manner and comprises a gas-liquid mixing unit 24 that mixes carbon dioxide gas into cleaning water fed to the beer hose 7 through the dispense head 6 by pressure using carbon dioxide gas supplied from a gas cylinder 5.SELECTED DRAWING: Figure 2

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