Subsoiling mechanism, subsoiling device, subsoiling system and use method of subsoiling system

The invention relates to the field of agricultural mechanical equipment, and provides a subsoiling mechanism, a subsoiling device, a subsoiling system and a use method of the subsoiling system. The subsoiling mechanism comprises a lifting assembly, a push rod and a subsoiler connecting plate, wherein one end of the lifting assembly is fixedly connected with a fixed component, and the other end ofthe lifting assembly is connected with a limiting block; the bottom of the limiting block is hinged with the middle of the subsoiler connecting plate through an ear plate, and a first end of the subsoiler connecting plate is provided with a tilt angle sensor, and a second end of the subsoiler connecting plate is hinged with a subsoiler; a first insertion hole for insertion of a shear pin is formedin the second end of the subsoiler connecting plate in a transverse penetration manner, and a subsoiler is provided with a second insertion hole corresponding to the first insertion hole; the shear pin is connected with a tor