The invention provides an ultra-limit narrow clearance anti-counterfeiting method and product. According to the ultra-limit narrow clearance anti-counterfeiting method and product, a code and an image-text are printed on a printing material, and an ultra-limit narrow clearance is generated randomly; narrow clearance feature information is shot and collected; the narrow clearance feature information is stored in a cloud database; a cloud end receives narrow clearance feature information to be detected sent by the camera phone of a user; the narrow clearance feature information to be detected ismatched with a clearance feature file; and identification conclusion information is fed back to the camera phone of the user. The ultra-limit narrow clearance applied by the method of the present invention is much narrower than printing limit width, and therefore, the ultra-limit narrow clearance cannot be reproduced. Compared to the prior art, the method of the present invention omits a short pile printing unit, so that normal printing production will not be interfered by the short pile printing unit.