The present invention relates to a payment information providing system using a wearable device, and more specifically, the payment information providing system includes: a wearable device for recognizing and photographing a product image by sensing a motion of a user and transferring the photographed product image to a product information providing device, and receiving product information transferred from the product information providing device and displaying the product information on a screen; the product information providing device for receiving the product image from the wearable device and providing information on a product related to the product image to the wearable device; and a contents providing server for receiving the product information from the product information providing device and transferring digital contents to the wearable device if a product to be purchased is selected according to the received product information.