The invention discloses an automatic shackle grinding device. The automatic shackle grinding device comprises a robot arranged in the middle of a working area and further comprises a plurality of grinding machines arranged on the left side of the working area, a hand replacing frame arranged between the grinding machines, a control assembly on the right side of the working area, an inner circle grinding machine, a scanner and a plurality of feeding and discharging sliding tables arranged on the lower portion of the working area, wherein the inner circle grinding machine and the scanner are arranged on the upper portion of the working area. A clamp structure used for clamping shackles is further arranged on the robot. The control assembly is driven by an automatic control system to controlthe robot, the grinding machines and the scanner to work; the scanner calibrates the path and posture of the robot, and the robot conveys the shackles on the feeding and discharging sliding tables tothe grinding machines to be ground; and thus the efficiency is high, manual work is saved, and the grinding effect is better.