A safety hook includes a hook body, a pivotable safety retainer biased to a locking position, and a pivotable latch member biased to abut against a distal end of a hook portion of the hook body to thereby close a hook mouth defined by the hook body. The safety retainer includes a stop portion and an abutment face unit. When the safety retainer is disposed in the locking position, the stop portion abuts against the latch member, and the abutment face unit is adjacent to and spaced apart from a stop block of the hook body. In the locking position, if an external force is applied to pivot the latch member away from the distal end of the hook portion, the abutment face unit will come into contact with the stop block to prevent further pivoting movement of the latch member.