The invention belongs to a rear bar inserting method for a super-long CFG pile. The rear bar inserting method comprises the following steps: introducing the CFG pile into a specified position and piling, and performing a soil sampling operation in the piling process; filling concrete into a pile hole of the formed pile; manufacturing a bar inserter: operating for the pile hole filled with concrete; immediately performing bar inserting operation after concrete filling is completed; performing a bar inserting operation process from top to bottom for not more than 2 minutes, controlling vibrationamount of a vibrating hammer in a graded mode, inserting the bar inserter and a reinforcement cage through dead load at an initial stage of bar inserting operation, controlling vibrating amount of the vibrating hammer to be 10-15 kw for inserting, and controlling to insert with the maximal vibrating amount of the vibrating hammer in the rear half process; enabling length of an inserted bar in thebar inserting process to be 30 m at most; and pulling out the bar inserter. The rear bar inserting method has the advantages that the bar inserter is simple in structure, the technological flow design is reasonable, piling is stable and operability is high.