A composite current collector contains: a substrate and a composite portion formed on at least one surface of the substrate. The composite portion includes a connection layer, a conductive layer, and an insulation layer. The conductive layer is located on the connection layer, and the insulation layer is defined between the connection layer and the conductive layer. A first side of the insulation layer is connected with the connection layer, and a second side of the insulation layer is connected with the conductive layer. The insulation layer is configured to stop an action of the connection layer to the conductive layer. Thereby, reaction of the conductive layer to the connection layer is eliminated by the insulation layer to enhance connection strength of the composite portion and the substrate, thus prolonging the service life of the composite current collector.

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