The invention provides an auxiliary locating device and method of an arc-shaped embedded sleeve. The auxiliary locating device comprises an end socket hole forming piece, a first locating block and asecond locating block. The end socket forming piece is connected with a first side formwork. The end socket hole forming piece is used for forming an end socket hole. The first locating block is connected with the end socket hole forming piece and used for being connected with one end of the arc-shaped embedded sleeve. The second locating block is connected with the second side die. The second locating block is used for being connected with the other end of the arc-shaped embedded sleeve. By the adoption of the auxiliary locating device and method of the arc-shaped embedded sleeve, by means ofthe structure of the end socket hole forming piece, the first locating block and the second locating block, the arc-shaped embedded sleeve can be reliably fixed and is prevented from moving and rotating in the pouring process; and the arranged end socket hole forming piece can form the installation positions of nuts, and therefore in the following gathering procedure, it is not needed to cut theend of the arc-shaped embedded sleeve. The auxiliary locating device and method of the arc-shaped embedded sleeve have the advantages of being high in operability and good in economical efficiency.