The invention discloses a mechanical transmission full-sealing device for a kettle. The device comprises a power source component (1) on the upper portion, a power output component (2) at the lower end, a supporting connecting component (3) and a sealing transmission component (4). The supporting connecting component (3) is located between the power source component (1) and the power output component (2), has the sealing effect and is located on the outer side, and the sealing transmission component (4) is located between the power source component (1) and the power output component (2) and located on the inner side. The power source component (1), the power output component (2), the supporting connecting component (3) and the sealing transmission component (4) are installed on the sealing kettle (5). The sealing transmission component (4) comprises an isolation component (401), a driving part (402) and a driven part (403). The isolation component (401) comprises a flexible sealing pipe (4011), a supporting annular piece (4012) and a cylindrical bowl (4013). After the mechanical transmission full-sealing device for the kettle replaces a magnetic transmission full-sealing device for a kettle, the mechanical transmission full-sealing device has a series of advantages of being low in cost, convenient to manufacture, install and use, high in transmission efficiency, large in transfer power and the like.