Prefabricated box culvert tongue-and-groove mortar concave joint hooking device

The utility model discloses a prefabricated box culvert tongue-and-groove mortar concave joint hooking device which comprises a foldable handle, a hinged support, a nylon round wheel, a scraping piece, a rolling wheel, a telescopic spring rod and a boss, the foldable handle is divided into a front part and a rear part which are fixedly connected through an inserting block, the side face of the foldable handle is provided with a groove, and the inserting block can be inserted into the groove. When the operation position is high, the insertion blocks on the two sides of the foldable handle can be pulled out, the two sections of the foldable handle are bent to form right angles, the right-angle insertion blocks are inserted into the two sides of the foldable handle, and the foldable handle can be folded into the right-angle insertion blocks. A worker can continue to work by holding the end of the foldable handle by hand, the protruding plates on the two sides of the baffle can be detached to facilitate use when