A marine mineral gripping device comprises a supporting frame and a balancing weight, and is characterized in that supporting legs are mounted on the periphery of the supporting frame, outer frames are arranged on two sides of the supporting frame, a guide frame is mounted in the supporting frame, second supports are mounted on two sides of the guide frame and are hinged to second connecting rods, one end of a rocker arm is hinged to each second connecting rod, and the other end of each rocker arm is connected with a material shovel. The marine mineral gripping device has the advantages that by mechanical movement and a physical principle, the marine mineral gripping device enables a mining device to automatically grip mineral aggregates at a high speed, and collecting operation is simple; a plurality of devices can operate in a region simultaneously, mining speed is high, and accordingly the marine mineral gripping device is suitable for being popularized and used.