Ventilation grille for ship

The ventilation grille for the ship comprises a ventilation frame, and ventilation holes are formed in the ventilation frame. The main baffle is located in the ventilation hole, the main baffle is provided with an inner cavity, and rectangular openings communicating with the inner cavity are formed in the two sides of the main baffle correspondingly; the two auxiliary baffles are connected to the main baffle and penetrate through the rectangular opening; the rotating cylinder is rotationally connected to the ventilation frame, and one end of the rotating cylinder extends to the ventilation hole and is fixedly connected with the main baffle; the rotating shaft penetrates through an inner hole of the rotating cylinder, one end of the rotating shaft extends into the inner cavity and is provided with a driving part, and the driving part is used for driving the two auxiliary baffles to stretch out or retract; and the locking assembly is connected to the outer wall of the ventilation frame, and the locking assembly