A connection lock is provided. A driving assembly is disposed to a shell body, is movable to be in first or second positions and further has a restricting portion. A lock device is disposed to the shell body and includes a lock member which is movable relative to the shell body to be in unlocked or locked positions and has a tendency to move toward the locked position. An actuating member is slidably disposed in the shell body. A first elastic member is disposed in the shell body and abuts against one of the actuating member and the driving assembly to bias the driving assembly in a direction toward the first position. A engaging assembly is disposed in the shell body and is movable to be in released or engaged positions and is configured to be inserted into an anti-theft hole of an object.