The invention discloses a chamfering device for the shaft end holes of a crankshaft. The chamfering device comprises a chamfering worktable; a crankshaft chuck and a chamfering machine are arranged on the chamfering worktable; the chamfering machine comprises a chamfering drill bit, a drill chuck and a driver; the chamfering worktable is also provided with a driver support; the driver support comprises a support rack and a rotary shaft arranged on the support rack; connection rods are arranged between the rotary shaft and a driver; a cooling oil supplying post is also arranged on the chamfering worktable; the cooling oil supplying post is as high as the crankshaft; a crankshaft laying rack is also arranged on one side of the chamfering worktable; and the crankshaft laying rack is detachably arranged on the chamfering worktable. By adopting the chamfering device, a chamfering task for the central holes in two ends of the crankshaft can be rapidly and high-efficiently finished; besides, the chamfering precision of the chamfering device is high in precision; and cooling effect is good.