The invention discloses a plough used for soil plowing and deep bury and returning to field of straws. The plough used for the soil plowing and the deep bury and the returning to field of the straws comprises plough coulters, a small front plough, main ploughs, a depth roller and a rack, wherein the plough coulters, the small front plough, the main ploughs and the depth roller are fixed on the lower portion of the rack, and the plough coulters are installed at the front of the small front plough, respectively positioned on the lower portion and the right portion of the small front plough, and used for cutting off straws and crop residues in a motion path to cut orderly ditch walls. The small front plough is positioned between the plough coulters and the main plough and used for turning the straws and the crop residues cut off by the plough coulters on the earth surface of the soil upside down and discharging the straws and the crop residues to the plough ditch turned up by the main ploughs in last plowing. The main ploughs are installed on the back portion of the small front plough, respectively positioned on the lower portion and the left portion of the plough coulters, and used for plowing the ditch walls and covering the plowed turned-up soil on the plough ditch turned up in the last plowing. The depth roller is positioned on the upper portion of the main plough and used for depth limit. By the application of the plough used for the soil plowing and the deep bury and the returning to field of the straws, water, fertilizer, gas and heat conditions in a plough layer structure can be optimized, and crop output can be improved.