The invention provides an automatic reloading system. After one roll of materials are used up, a host does not need to shut down, another roll of materials can be continuously supplied, intermittent running of the host is guaranteed, the overall forming efficiency is improved, the normal working time of the host is ensured, and the production efficiency is improved. The automatic reloading system comprises two sets of feeding structures corresponding to one host. When one of the two sets of feeding structures feeds materials to the host, the other set of feeding structure finishes feeding and discharging and is in a state that feeding is waited, and the two sets of feeding structures are switched with each other to finish continuous material supplying for the host.