The present invention provides a preparation method of no-washing Pu'er tea. The Pu'er tea which needs no washing and can be drunk directly is obtained by the processing steps of tea leaf screening, tea cutting, tea screening again, leaching, sterilizing and drying. The preparation method realizes an instant brewing and drinking of the Pu'er tea. The tea leaves prepared by the technology is significantly lowered in the total number of microbial colonies, the floating dust on the surface of the tea leaves is removed, the appearance of the Pu'er tea gives people a refreshing and clean whole-new visual sense, and at the same time, the mouthfeel and taste after the brewing are also significantly improved.