The invention provides a fully automatic transplanting combined machine. The machine includes traction equipment, operation equipment and a control system. The operation equipment is installed on a main machine frame and towed behind the traction equipment. The machine is characterized in that the operation equipment includes a rotary tillage ditching system, a micro soil preparation narrow-ditch formation system, a transplanting system and a soil covering and pressing system. The transplanting system includes more than one transplanting units. The combined machine can perform ordered rotary tillage stubble cleaning on an untilled land, bed surface leveling, ditch formation, narrow slit formation, transplanting, soil covering and compacting at a time, the soil condition required by high-speed transplanting of blanket seedlings of crops such as rapeseed is met, soil is not easily attached onto working parts for tillage and soil preparation, the transplanting quality can still be guaranteed under the condition of high-speed transplanting, structure configuration is reasonable, production, manufacturing, management and maintenance are easy, and the machine is suitable for application and popularization.