Minitype bar code and its recognition system and identification method

The invention relates to a micro bar code and its identifying system and method. The micro bar code comprises many nanometer units arranged by presetting mode, and different nanometer unit has different nanometer molecule; the identifying system and method uses a sensing module to sense the nanometer unit and nanometer molecule array mode of micro bar code, then transmits the sensing result to a computing module and inputs the sensing result into a bar code data package which stores each set of nanometer unit and nanometer molecule arranging mode corresponding information, so that it can identify the identified information of the micro bar code and can transmit the identified information into computing module to record it.