Galvanized sink roll with long service life

The utility model discloses a galvanized sink roll with long service life. The galvanized sink roll comprises a zinc pot, a liquid feeding mechanism, a galvanizing mechanism and a positive pressure mechanism, two mounting holes are symmetrically formed in one sides of the top ends of the opposite side walls of the inner cavity of the zinc pot; the galvanizing mechanism comprises a sink roll; the two ends of the sink roll are rotationally connected with connecting shaft units correspondingly. The connecting shaft unit is fixedly mounted in the mounting hole; the liquid feeding mechanism comprises a conveying assembly, a flow guide plate and a driving assembly; the guide plate is arranged right above the sink roll through two fixing blocks fixedly mounted on the top surface of the zinc pot; one end of the conveying assembly is arranged at the bottom of the inner cavity of the zinc pot, and the other end inclines towards the guide plate and is arranged right above the guide plate; and the positive pressure mecha