Leakage-proof device for wharf crane grab bucket

The invention relates to the technical field of crane grab buckets, and provides a wharf crane grab bucket leakage-proof device which comprises a connecting base and supports, the supports are fixed to the corners of the top end of the connecting base, top frames are fixed to the top ends of the supports, and traction structures are arranged on the two sides of the top end of the connecting base. And connecting frames are fixed to the two sides of the bottom end of the connecting base correspondingly, a first grab bucket is arranged on the inner sides of the connecting frames, a second grab bucket is arranged on one side of the first grab bucket, and connecting rods penetrate through the top of the first grab bucket and the top of the second grab bucket correspondingly. By arranging the leakage-proof structure, the second grab bucket can drive a protection plate and teeth to enter the groove when rotating, at the moment, the protection plate can block a gap between the side edges of the first grab bucket and