The invention provides a double-head overprinted colour scale group which comprises multiple reference colour scales arranged at equal intervals, wherein a first blank is arranged between every two adjacent reference colour scales; the outer sides of the reference colour scales at two ends are provided with synchronous heads; the reference colour scales are of an equicrural triangle shape; the synchronous heads consist of wide marks and narrow marks; the wide marks are adjacent to the reference colour scales; second blanks are arranged between the wide marks and the narrow marks; the width of the wide marks is greater than that of the narrow marks; the first blanks are used for filling overprinted colour scales which are of an equicrural triangle shape. Compared with a traditional overprinted colour scale, the double-head overprinted colour scale group provided by the invention can be used for not only realizing the requirement of positively or reversely printing automatic addressing, but also realizing criss-cross overprinted error detection; a first color is used as blank reference, single-reference measurement is performed, and addup errors do not exist; the double-head overprinted colour scale group also has the advantages of simple structure, reasonable design, practicability and convenience.