Closed material grab bucket

The utility model discloses a closed material grab bucket which comprises a main bucket body, an auxiliary bucket body, an opening and closing transmission mechanism and an overflow control mechanism, the main bucket body and the auxiliary bucket body are respectively provided with an opening side, the upper parts of the main bucket body and the auxiliary bucket body are mutually hinged, and the two opening sides are mutually inserted to realize closing, and an overflow port is formed in the opposite surface of the opening side of the main bucket body. The opening and closing transmission mechanism comprises a pair of telescopic rods arranged on the main hopper body, the telescopic rods are used for stretching out and drawing back and driving the auxiliary hopper body to rotate, and the overflow control mechanism comprises an arc-shaped guide rail arranged outside the main hopper body, a closing plate slidably connected with the arc-shaped guide rail through a sliding block and a power module used for control