The invention relates to a device for breaking hardened soil layers during open-air planting of belamcanda chinensis, and in particular discloses a device for breaking soil layers and preventing rhizome damages through revolution and rotation between two non-parallel shafts and matching a cutting angle of a turning plate. The device is characterized in that an adjusting sleeve is arranged on a suspension arm, and a plurality of mounting holes are equidistantly formed on the suspension arm; a transmission shaft is sleeved in the adjusting sleeve and fixed by a bearing; a driving sleeve is sleeved on one end of the transmission shaft; a connecting plate is arranged at the other end of the transmission shaft and is a V-shaped plate with a V-shaped included angle being an obtuse angle; the transmission shaft is perpendicular to a plate surface of the connecting plate; a connecting shaft is vertically arranged on the other plate surface of the connecting plate and penetrates through the connecting plate; a shaft sleeve is arranged between the connecting shaft and the connecting plate; a driving wheel is arranged at one end of the connecting shaft and jointed with the transmission shaft;a connecting sleeve is arranged at the other end of the connecting shaft and positioned below the transmission shaft; and the included angle between the connecting shaft and the transmission shaft isan acute angle.