A portable power bank with card storage function include a portable power bank module and a card case module; the portable power bank module and the card case module are slidably connected via a connector; the portable power bank module is provided with a guiding mounting rod; the guiding mounting rod is mounted in a sliding slot of the connector; the sliding slot is recessed inwards with an opening at each end thereof; the portable power bank module is assembled to the sliding slot via the guiding mounting rod; one side of the card case module is provided with a connecting strap which is hollow inside and opens at both ends; the connecting strap is connected to the connector via a connecting shaft. This invention has the advantages of providing users with the convenience of card storage and serving as a contingency power supply for supplying power to electronic devices. It serves multiple functions and is convenient for actual use. It is easy to carry, helps to prevent loss of properties, and suitable for users' needs. The card case module and the portable power bank module can be dissembled and used separately.