The utility model provides a marine ventilator and ventilation structure of utensil with this ventilator. Marine ventilator includes barrel and closing device, and closing device includes shutoff piece and pneumatic actuator, shutoff piece movably sets up in the barrel and seals or open down the barrel, the pneumatic actuator is connected and is driven the activity of shutoff piece, and the pneumatic actuator is driven by compressed gas. Marine ventilation structure including set up in the air funnel of vent department with set up in the ventilator at air funnel top, the barrel of ventilator is installed in the top of air funnel, and closing device's pneumatic actuator passes through the trachea and connects the compressed gas source, marine ventilation structure is still including the control mechanism who is used for controlling the trachea break -make. The utility model discloses in, conversion that the ventilator adopted pneumatic drive structure to realize opening and close the state, closing device's simple structure, easy to carry out can realize automatic control, need not the operation of artifical high altitude construction, has solved present vent closing device and has had the dangerous problem of operation.