Waterproof and drainage system for underwater tunnel connection position

The invention relates to the field of tunnel construction, in particular to a waterproof and drainage system for an underwater tunnel connection position. Comprising a waterproof device and a drainage device, the waterproof device is arranged between a primary supporting layer and a secondary molded lining layer of a tunnel, the waterproof device comprises geotechnical cloth, the geotechnical cloth is arranged on the inner wall of the primary supporting layer, and a waterproof plate is arranged on the side, facing the interior of the tunnel, of the geotechnical cloth and is longitudinally laid and hung along the inner wall of the tunnel; the waterproof plates are arranged at the corners of the tunnel connecting points in a bent mode, the middle-buried type self-adhesion water stop belts are further arranged at the construction joints of the corners of the tunnel connecting points and can prevent water from permeating from the construction joints, and the drainage device is arranged between the primary support