The invention discloses a hot-melt quick-connecting device for digital cable and a connecting method thereof. The method comprises: preparing a copper tube; injecting solder into the copper tube; punching the solder according to the diameter of a digital cable; butt-jointing a peeled insulating core in the copper tube; heating the copper tube to reach the melting point of the solder, and fixing the insulating core; moving a heat shrinkable protective sleeve to a position of the copper tube, and then heating the heat shrinkable protective cover, allowing the heat shrinkable protective cover tocover a connection part of the insulating core to complete the connection of the digital cable. Cable connection is realized, and the device is easy to operate, is stable and reliable, and is flexiblein applicability.