Registration precision detection method for detecting paper presswork

The invention discloses a registration precision detection method for detecting a paper printed matter. The registration precision detection method comprises the following steps: S1, obtaining a color code area image of the paper printed matter with qualified precision as a standard image; s2, printing areas corresponding to all printing plates in the standard image are selected, and the position relation between all the printing areas in the standard image is obtained; s3, acquiring a color code area image of a to-be-detected paper printed matter as a to-be-detected image, selecting a printing area corresponding to each printing plate in the to-be-detected image, and acquiring a position relationship among the printing areas in the to-be-detected image; and S4, comparing whether the position relationship among the printing areas in the to-be-detected image is matched with the position relationship among the printing areas in the standard image, if the comparison is successful, determining that the registrati