Safety door device of marine engine room

The safety door device comprises a cabin aisle, a built-in door is arranged at the inlet end of the cabin aisle, an inner protection mechanism is arranged in the cabin aisle, the outer wall of the cabin aisle is connected with an outer protection mechanism, and an auxiliary mechanism is arranged in the outer protection mechanism; when the protective door is closed, the bolt plate is inserted into the U-shaped groove, the pull block is pulled outwards, the pull block pulls the spring and drives the insertion block to move out of the insertion hole, the insertion rod can be inserted into the through hole and the square groove, the insertion rod fixes the bolt plate, and therefore the protective door is fixed; the inserting rod can be located in the center of the protective door, the two sides of the peripheral frame are prevented from being damaged, the inserting rod can be taken out conveniently to be away from the edges of the two sides of the peripheral frame, and the time for opening the protective door is