An identification tag information reminder system and a method thereof are provided. The system comprises an identification tag, for storing a tag identification code, an identification condition data and a reminder message corresponding to the identification condition data; and a portable device, comprising a memory, for storing a plurality of predetermined reminder conditions; an identification tag access module, for accessing the tag identification code, the identification condition data and the reminder message corresponding to the identification condition data of the identification tag; a processing module, for comparing the predetermined reminder condition with the tag identification code and the identification condition data to generate a comparison result; and an indicating module, for outputting the reminder message according to the comparison result.