A submarine-specific porthole device includes a window connected with a double-layer explosion-proof glass through a connecting device. The connecting device comprises reinforcing ribs provided with grooves matching clamping slots on the explosion-proof glass. Silica gel pads fill connection points between the grooves and the matching slots, and are connected through a curing agent. Fixing hoops are arranged on that reinforcing ribs and the explosion-proof glass. The reinforcing ribs are provided with air holes connected with a gate through a locking member. The reinforcing ribs are provided with supports perpendicular to the reinforcing ribs. A light-transmitting base plate is arranged in that middle of the double-layer explosion-proof glass. A transverse bar is arranged on the top of thewindow, and the transverse bar is connected with a rolling curtain device. The rolling curtain device comprises a rolling curtain fixed by a rotating shaft. Safety rings are arranged at two ends of the rotating shaft. The safety rings are connected with a limiting block. The limiting block is provided with a fixing bar. The fixing bar is vertically welded with the transverse bar. The rotating shaft is respectively connected with an adjusting knob and a hand swing handle. The submarine-specific porthole device is sealed, stable, pressure-resistant, waterproof, moisture-proof, corrosion-proof,convenient for sampling and investigation, and has privacy.