Padlock that can control operation of locking hook

A padlock, comprising:

• a housing having a protrusion;
• a locking hook having a connecting end and a locking end, wherein the connecting end of the locking hook is extended into the housing and axially movable in the housing, and the locking end of the locking hook is rotatable about the connecting end of the locking hook to an opened position and a closed position;
• a locking barrel that is rotatable by a specific key;
• a locking member driven by the locking barrel and having an insertion recess and a slide slot, wherein the insertion recess of the locking member is extended from a top face toward a periphery of the locking member to form an opening, the slide slot of the locking member is extended from the opening of the insertion recess of the locking member to the bottom thereof and extended through a length along the periphery of the locking member, the protrusion of the housing is mounted in the slide slot of the locking member so that when the locking end of the locking hook is located at the closed position, the locking member is driven by the locking barrel to move to a first position where the opening of the insertion recess of the locking member is closed by the protrusion of the housing and a second position where the opening of the insertion recess of the locking member is opened by the protrusion of the housing.