A post drink holder device securely holds multiple beverage containers on an existing post such as a on a boat dock. The device includes a base wall coupled to and extending downwardly from a lower surface of a panel defining a post receiver for receiving a post therein such that the panel is supported on the post. An upper wall is coupled to and extends upwardly from an upper surface of the panel defining a primary cup for receiving a beverage container. Each of a plurality of outer cups extends into the upper surface and through the panel for holding additional beverage containers.