Shutter blade for ship

The invention discloses a shutter blade for a ship. The blade comprises a first folded plate, a second folded plate, a third folded plate and a first sealing strip, wherein the second folded plate and the first folded plate are oppositely combined to form a cavity between the second folded plate and the first folded plate, and two ends of the cavity are sealed through the third folded plate and/or the first sealing strip. The first sealing strip comprises a deformable head part and a clamping part which extends and protrudes from the deformable head part, the end part of the clamping part is bent to form a groove-shaped groove, and the clamping part of the first sealing strip is attached to the second folded plate or the third folded plate and enables the edge of the second folded plate or the third folded plate to be clamped and plugged in the groove-shaped groove. When the shutter blade is mounted in a double-layer shutter, after the double-layer shutter is closed, an inner closed space and an outer closed