The utility model relates to a tail tube tie-back inserting head, and belongs to the technical field of oil drilling tail tube tie-back well cementation cement injection tools. The tail tube tie-back inserting head is composed of a body, a guiding shoe, a guiding tube and sealing rings, the body is of a tubular structure, internal threads are machined at the two ends of the body, a plurality of rectangular grooves and a plurality of trapezoid-shaped grooves are machined in the outer wall of the body, and the sealing rings are contained in the rectangular grooves. The guiding shoe is of a semispherical structure, external threads are machined at the position, with the largest outer diameter, of the guiding shoe, a through hole is formed in the semispherical top, and internal threads are machined on the semispherical top of the guiding shoe; the guiding tube is of a tubular structure, and external threads are machined at one end of the guiding tube. The body, the guiding shoe and the guiding tube are sequentially connected through threads, the guiding shoe is arranged between the body and the guiding tube, and the guiding shoe and the guiding tube are both made of easily-drilled materials. The tail tube tie-back inserting head has the advantages of being reasonable in structure, easy and convenient to operate, reliable in function, and capable of improving the sealing performance and strength of the tail tube tie-back position, and completely meeting the working requirement.