The invention discloses a method for separation of a shield tail and a forming segment in the process of shield receiving. 1, Supporting arms are made; 2, a propulsion cylinder under a shield body is taken back, the first supporting arm is put in place through a segment erector, the first supporting arm and a receiving loop segment are connected through an arc-shaped bolt, and the propulsion cylinder under the shield body tightly butts against a supporting steel plate on the other end portion of the first supporting arm; 3, propulsion cylinders on the positions of inclined left 45 degrees and inclined right 45 degrees under the shield body are taken back in sequence, and a second supporting arm and a third supporting arm are installed by adopting the same method as the second step; 4, the shield body and the propulsion cylinders are operated to conduct a synchronous propulsion, and the remaining propulsion cylinders of the shield body are prevented from being started; 5, a portal waterproof device is tensioned through a chain crane; and 6, when the shield body is propelled to a third shield tail and a sealing brush completely breaks away from the receiving loop segment, the separating work is finished. The method for separation of the shield tail and the forming segment in the process of shield receiving has the advantages that mechanized operation is achieved, safety and reliability are achieved, the construction efficiency is greatly improved, and the labor cost is reduced greatly.