The invention discloses a paint hiding power detecting method and comparison method, and relates to the technical field of paint hiding power detection. The invention provides the paint hiding power detecting method and comparison method with the advantages that the simplicity is realized, the implementation is easy, and the hiding power characterization results are precise. The paint hiding power detecting method comprises the following steps that A, paint pigment slurry is manufactured; B, the paint pigment slurry is prepared into a paint film; C, the paint film is dried, and is cooled to normal temperature; D, the color difference delta E of the paint film on a black base and a white base is detected; the smaller delta E indicates the higher hiding power; the greater delta E indicates the lower hiding power. The hiding power of two types of paint is measured by the method, i,e., the hiding power of the two types of paint can be compared, so that the paint hiding power comparison method is obtained. The methods provided by the invention are used for measuring and evaluating the hiding power of titanium dioxide in the paint; the result precision is high; the operation is simple and convenient; the implementation is easy; the analysis process is intuitive and clear. The methods are mainly applicable to paint using the titanium dioxide as pigment.