The invention discloses a qualitative detection method of channel-freeing phlegm-eliminating capsules. A qualitative identification method of Radix et Rhizoma Rhei in original channel-freeing phlegm-eliminating capsules. Additionally, (1) a developer is prepared at low temperature of -5 DEG C, and developing is carried out; (2), diethyl ether is used to treat a sample instead of macroporous resinfor eluting. Compared with the prior art, the method herein has the advantages that color rendering results are accurate, the main ingredients have clear spots, good reproducibility and high accuracy,the corresponding spots of chrysophanol and physcion are effectively separated, and accurate judging can be made; sample treating time can be greatly shortened, efficiency is improved, and detectionresults can be attained quickly; potential hazard to human health is relieved, and quality controllability and stability of channel-freeing phlegm-eliminating capsules are improved.