Grab device for remotely operated vehicle

The invention relates to a grab device for a remotely operated vehicle. The grab device comprises a rotation module, a transmission module and a grab module, wherein the rotation module is connected with a control system of the remotely operated vehicle by virtue of a watertight connector, so that the rotation module is rotated to form circular motion; the transmission module is connected with the rotation module, and the circular motion of the rotation module is transformed into transverse motion; and the grab module is connected with the transmission module, and the grab module makes opening and closing motion under control of the transverse motion of the transmission module so as to carry out encircling grabbing on an underwater target. The grab device has the advantages of small size, low cost, pressure tolerance and the like, and is suitable for a remotely operated vehicle to carry out underwater grabbing operation on smooth or irregular objects.