Abstract: A cable locking device with an automatic pop-up feature is provided. The cable locking device includes a main body and a cable having one end fixed to one side of the main body and the other end releasably fastened to and locked by a spring-biased locking mechanism mounted in the main body. The cable can be easily locked to the locking mechanism simply by snapping a locking head fixedly connected on the locking end of the cable to the locking mechanism. To unlock, the user needs just to insert the associated key of the locking device to the locking core of the locking device and turn it to the unlocking position. By a head pop-up mechanism, the locking head can be popped up to the outside of the main body. The operation of the cable locking device is thus very easy and effortless.