The aim of this study was to realize image anti-counterfeiting grating by phase adjustment latent image technology using the halftone image screening principle as the theoretical basis. Firstly, original artwork and latent image were designed, screening parameters were set up for digital screening, latent image was embedded respectively in C,M,Y,K channels as security master. Secondly, digital grating with corresponding period was designed according to the difference of screen ruling, and then combined with security master to finish the extraction of security information. Finally, the latent image concealment and information extraction effect of each channel were evaluated using the weighted signal to noise ratio (WSNR) and color image structure similarity method (CISI). The concealment of the hidden information was good and the extraction and reproduction of the hidden information was clear. This method had no obvious selectivity towards screen ruling of the image, while sub-channel had a significant impact on the anti-counterfeit effect. K channel had the worst latent concealment, and was not suitable as a security master. Channels M and C had the best latent extraction effect, and were suitable channels of the anti-counterfeiting method.