The invention relates to a detection device for deep sea watertight socket connectors, and concretely provides a device for autonomous detection of deep sea watertight socket connector performances. The device comprises a cabin body, end caps, an electronic frame structure, a watertight cable, deep sea watertight socket connectors and a deepwater pressure sensor. Two ends of the cabin body are in sealing connection with the end caps. The electronic frame structure is held in the cabin body and is pressed against the inner wall of the cabin body. The electronic frame structure is equipped with a battery group, a depth test plate, an acquisition control plate, an MOX module and a data reading plate. The depth test plate, the acquisition control plate, the MOX module and the data reading plate are electrically connected with the battery group. The deep sea watertight socket connectors are arranged on the end caps at two ends of the cabin body. The corresponding deep sea watertight socket connectors on the end caps at two ends are connected through the watertight cable. The deepwater pressure sensor is installed on the end cap at any end. The deepwater pressure sensor is electrically connected with the depth test plate through a wire inside the cabin. The device has advantages of simple structure, convenient detection, small occupation space, small dependence, wide application range, simple operation and the like.