Coffee machine water tank replacement device

The utility model discloses a coffee machine water tank replacing device which comprises a coffee machine body, and a water inlet hole is formed in the coffee machine body. The water inlet plug comprises a lower plug head, an upper plug head and a connector; after the lower plug is connected with the upper plug, a closed accommodating cavity with a one-way valve is formed inside; the connector is arranged at the upper end of the upper plug and is integrally connected with the upper plug; a connecting opening is formed in the upper part of the connector and can be detachably connected with a mineral water bottle opening in a sealing manner; the first water pipe penetrates through the lower plug from the lower part, extends into the closed accommodating cavity, is positioned below the one-way valve, and is connected with a water feeding mechanism of the coffee machine main body; the second water pipe sequentially penetrates through the connector and the upper plug from the upper portion, extends into the closed