The utility model provides an encapsulated cable connecting device of an explosion-suppression electrical appliance. The connecting device comprises a connector, a cable and a connecting mechanism fixed on an explosion-suppression cavity wall. The connector is assembly on one end, far away from an explosion-suppression cavity, of the connecting mechanism. One end, near the explosion-suppression cavity, of the connecting mechanism is provided with an encapsulated cavity. One end of the cable is connected with the connector, and the other end passes through the encapsulated cavity and then is connected with a working electrical appliance arranged in the explosion-suppression cavity. According to the utility model, the connecting mechanism and the connector are used for conducting intrinsic safe signals in an explosion-suppression electrical appliance, so the connecting device can be connected with the intrinsic safe signals of the working electrical appliance in the explosion-suppression cavity with no need for opening a cover of the explosion-suppression cavity and screwing open a cable joining device; and the connecting device is simple in structure and convenient to operate, so potential safety hazards are reduced, and working efficiency is improved.