Rehmannia medicinal material, rehmannia decoction pieces and identification method of patent medicine prepared from rehmannia decoction pieces

The invention relates to a rehmannia medicinal material, rehmannia decoction pieces and an identification method of a patent medicine prepared from the rehmannia decoction pieces. The method comprises the following steps: taking a sample to be detected, and preparing a test solution; taking a stachyose standard substance to prepare a reference substance solution, or/and taking a rehmannia reference medicinal material to prepare a reference medicinal material solution; sucking the test sample solution and the reference substance solution or/and the reference medicinal material solution, dripping the test sample solution and the reference substance solution or/and the reference medicinal material solution on a thin-layer plate, developing by taking a mixture of ethyl acetate, ethanol, water and ammonia water in a volume ratio of (1.5-2.5): (4.5-5.5): (3.5-4.5): (0.4-0.6) as a developing solvent, drying, spraying a color developing agent for developing, and inspecting. The method not only can be used for identif