Watertight mechanism for seabed investigation and seabed investigation device

The utility model discloses a watertight mechanism used for seabed investigation and a seabed investigation device, the watertight mechanism used for seabed investigation comprises a housing, the inner part of the housing is provided with an accommodating cavity, and the outer side of the housing is provided with a plurality of wiring grooves; the driving framework is arranged in the containing cavity in an embedded mode; the upper end cover is detachably arranged at one end of the shell, and a first plug-in groove is formed in the upper end cover; and the lower end cover is detachably arranged at the other end of the shell, and a second plug-in groove is formed in the lower end cover. According to the watertight mechanism, the functional instrument is installed on the driving framework of the containing cavity of the shell, the watertight plug-ins arranged in the first plug-in groove and the second plug-in groove are connected with the functional instrument to achieve functional support, the multiple wiring