The invention discloses a method for detecting and judging the quality of a packaging box of a solar cell or an assembly. The method comprises steps of: cutting a paper box to be tested into test samples, and soaking test samples with hot water for a period of time, at a temperature higher than 80 DEG C; separating a kraft liner board and a core paper layered, and then drying the papers; laying out a cobalt chloride test paper on the back surface of the kraft paper and the core paper respectively; dripping water on the front of the cow cardboard and the core paper; and judging whether the quality and the waterproof effect of the test sample meet the requirements or not, by determining whether the cobalt chloride test paper, which is on the back of the kraft liner paper and the core paper,has a water stain or a discoloration after a period of time. According to the method for detecting and judging the quality of packaging box of the solar cell or the assembly, the method is simple andreliable, and provides a method for effectively detecting the quality of the waterproof of the paper package.