Straw and subsoil mixing plough

The utility model relates to the field of agricultural machinery, particularly to a straw and subsoil mixing plough. The straw and subsoil mixing plough comprises a plough frame, a furrow topsoil plough, a surface scraping plough, a subsoil crushing plough, an undersoil crushing and mixing plough and a depth wheel, wherein the furrow topsoil plough, the surface scraping plough, the subsoil crushing plough and the undersoil crushing and mixing plough are sequentially mounted on the mounting beam of the plough frame, the depth wheel is mounted on the inclined beam of the plough frame, the furrow topsoil plough is used for ploughing a surface oil layer, the surface scraping plough is used for scraping surface stubble into ploughed furrows, the subsoil crushing plough is used for ploughing a subsoil layer, the undersoil crushing and mixing plough is used for ploughing an undersoil layer, the furrow topsoil plough, the surface scraping plough, the subsoil crushing plough, the undersoil crushing and mixing plough and the depth of the depth wheel are adjustable, the plough frame is connected with a tractor through connecting rods and a length-adjustable suspension rod. The ploughing depth of the straw and subsoil mixing plough can be adjusted by adjusting the length of the suspension rod. The straw and subsoil mixing plough effectively improves soil and the crop yield and is simple in structure, economical and practical.