The invention relates to the field of seabed detection devices, and aims at solving problems that a seabed exploring tube is liable to rotate in a peripheral direction under the action of an external force, enables a detector not to exactly face seabed sediments and not to carry out the measurement or enables a measurement structure to be inaccurate, and provides a seabed exploring tube. The seabed exploring tube is used for detecting seabed sediments, and comprises a housing and a detection device. The housing is provided with a first end and a second end, which are opposite to each other. The housing is provided with an annular inspection window surrounding the housing by one cycle, and the annular inspection window is close to the second end of the housing. The detection device is configured to be rotatingly connected to the interior of the housing, and the rotating axis is parallel to the axis of the housing. The detection device radially faces the annular inspection window. The beneficial effects of the invention are that the seabed exploring tube is provided with the full-cycle annular inspection window, and can always rotate to exactly face the seabed sediments below the seabed exploring tube under the action of gravity; the seabed exploring tube is convenient to use, and is accurate in detection result.