Combined tuber crop digging shovel and digging method

The invention relates to the technical field of agricultural instruments, in particular to a combined tuber crop digging shovel which comprises a rack, a hanging plate is arranged on the outer wall of one side of the rack, a connecting shaft is arranged on the outer wall of the rack, and two sets of straight shovel arms are rotationally arranged on the connecting shaft; a transverse shovel arm is arranged on the outer wall of one side of the straight shovel arm, and the grass cutting assembly is arranged on the straight shovel arm and used for cutting weeds when the digging shovel moves; the soil shoveling assembly is arranged on the transverse shovel arm and used for carrying out soil turning operation when the digging shovel moves; an adjusting assembly; and a locking assembly. According to the digging shovel, blocking and excessive power loss caused by weed winding can be avoided, the digging width can be flexibly adjusted, meanwhile, when the digging shovel is in a transportation or field transfer state,