The invention provides a position detection graph grouping method of a QR code. Three position detection graphs obtained by scanning are extracted; format information next to the two position detection graphs is obtained, the two pieces of format information is compared, and the three position detection graphs are determined to form a QR code version, thereby obtaining the dimension of the QR code; central point coordinates of the three position detection graphs as well as the QR code dimension are recorded; and the operation is carried out until grouping of all position detection graphs is completed. Therefore, the position detection graphs are grouped accurately and the precision is improved.