The invention discloses an external slip ring box of a shore power cable winch. The external slip ring box comprises a box body, a door 1, a door 2, slip rings, a slip ring connector, a slip ring hold sleeve, insulators and electric brushes. An electric brush support beam is arranged in the box body. The slip ring hold sleeve is installed on the electric brush support beam so as to support the slip rings. The insulators are also installed on the electric brush support beam. The insulators are provided with electric brush clamping seats. The electric brushes are installed in the electric brush clamping seats so as to support the slip rings. Through holes are respectively formed in the side surface and the bottom part of the box body so as to facilitate wiring. The external slip ring box of the shore power cable winch has the advantages that the external slip ring box has an independent box body structure and no longer needs to be installed in the cable winch, so that the maintenance and the replacing of the electric brushes are convenient, and the installation and the wiring are facilitated; in addition, a heater is added, the slip ring box is prevented against condensation, and the normal work of the slip ring box is ensured.