Sinking and floating type port safety gate

The utility model discloses a sinking and floating type port safety door which comprises a door frame, a pair of first sliding grooves are formed in the inner wall of the door frame, a safety door body is connected between the pair of first sliding grooves in a sliding mode, a movable seat is connected to one side of the bottom end of the safety door body, the safety door body is hinged to a ladder plate through the movable seat, and second sliding grooves are formed in the two sides of the outer wall of the ladder plate. The interiors of the two second sliding grooves are slidably connected with sliding blocks correspondingly, one sides of the two sliding blocks are connected with rotating shafts correspondingly, a pair of connecting pins is installed on the outer wall, close to the ladder plate, of the safety door body, pin shafts are inserted into the pair of connecting pins in a penetrating mode correspondingly, and the pair of connecting pins are movably connected with telescopic hydraulic cylinders thro