A kind of equipment for automatically withdrawing the band for animal, including the spool being rotatably installed in shell, for band selectively to be wound reconciliation winding. Spool includes the gear teeth for defining the hub of rotation axis and being arranged around the outer surface of hub. Gear train includes multiple gears, gear teeth of the multiple operated gear ground on the hub of spliced reel, with the rotation for gear train middle gear. It carries linkage and limits cavity, for installing a part of gear train, the rotation of linkage is carried when rotating for the gear in gear train. Locking pawl portion in shell can move between first position and the second latched position, and first position rotates freely through spool, and the second latched position locks spool and rotates it not. Cam face on the carrying linkage of rotation is configured to engagement claw, for allowing claw to move to the second position. Control knob selectively locates gear train relative to claw, with before locking pawl portion spliced reel is to prevent spool from rotating, selectively predetermined beam band stretches out the maximum length from shell.
