A refill adapter for a travel toothpaste tube is provided as an adapter which has one end to be engaged with a large-capacity toothpaste tube and the other end to be engaged with a travel toothpaste tube. The refill equipment is integrated with a cap for the travel toothpaste in order to be carried together with the cap as one body. The cap for the travel toothpaste tube includes a refill adapter, which is configured to be a hollow tube and have one end to be engaged with a nozzle of a large-capacity toothpaste tube and the other end to be engaged with a nozzle of the travel toothpaste tube, and an upper cap configured to be detachably engaged with the one end of the refill adapter.