A tool locking device includes a tool shank having a bore for slidably receiving a shaft, a detent slidably received in the tool shank for detachably engaging with a tool member, a shaft slidably engaged into the tool shank and having a recess for selectively receiving the detent and having an actuating portion for forcing the detent to engage with the tool member, a button slidably received in the tool shank for actuating the actuating portion of the shaft to engage with the detent. and a shielding device has an opening and a slot for engaging the button through the slot and into the opening of the shielding device for shielding and protecting the button and for preventing the button from being operated inadvertently.
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