A safety hook includes a hook body comprising a recess at back of an intermediate portion, a locking dog at one end, a ring at the other end, and a front opening; a spring depressible latch member having a U section and comprising a plate interconnecting two side walls, the latch member being pivotably disposed on the back of the intermediate portion of the hook body with the plate being seated upon a flat portion of the recess; and a spring depressible lock member having a U section and comprising two side walls and a through hole on a groove portion. The lock member is pivotably disposed on a front side of the hook body with the side walls thereof partially straddled the hook body to be seated upon a portion of the plate. The locking dog is inserted into the through hole when the safety hook is locked.