The utility model relates to the technical field of self-floating lamps and provides an intertidal zone underwater obstacle caution self-floating device. The intertidal zone underwater obstacle caution self-floating device comprises a floater body, a connecting rope and an anchor, wherein a caution reflecting layer is fixed to the upper portion of the floater body, a flicker caution lamp is fixed to the top of the floater body, the bottom of the flicker caution lamp is connected with a power supply, a mounting cavity is arranged at the bottom of the floater body, a compression spring is arranged in the mounting cavity, a limiting ring used for limiting the compression spring into the mounting cavity is fixed to the lower end of the mounting cavity, one end of the connecting rope is wound around the compression spring, the other end of the connecting rope is located on the outer side of the mounting cavity, and the anchor is fixed to the other end of the connecting rope. The intertidal zone underwater obstacle caution self-floating device is reasonable in structure and convenient to use and has the advantages that caution is accurate, wherein when a disk moves under the influence of airflow, the compression spring of the device can provide recovery force to make the device move back to the position over an obstacle, it is ensured that the flicker caution lamp is located over the obstacle, and the accuracy is guaranteed; the caution effect is obvious.