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The utility model discloses a kind of sealing structure of maintenance window on sheet metal box, comprising: annular backing plate and cover, cover is set in the outside of maintenance window by annular gasket, specific setting mode is as follows: annular backing plate is provided with press-in screw, annular backing plate is provided with riveting installation hole, sheet metal box is provided with countersunk riveting installation via hole and press-in screw via hole around maintenance window, after press-in screw sleeve O type sealing ring, corresponding from the corresponding press-in screw via hole of sheet metal box, countersunk blind rivet is selected and set in the countersunk riveting installation via hole on sheet metal box and the riveting installation hole on annular backing plate, cover is provided with annular installation edge, annular gasket and the annular installation edge of cover are all provided with press-in screw via hole, press-in screw continues and passes through the press-in screw via hole of annular gasket and annular installation edge, after being provided with nut. The sealing structure of maintenance window in the utility model is applied on various sheet metal box.