Drug for treating diabetes mellitus and preparation method of drug

The invention discloses a drug for treating diabetes mellitus and a preparation method of the drug. The drug is prepared from radix astragali, radix salviae miltiorrhizae, rhizoma dioscoreae, rhizomaatractylodis, radix scrophulariae, radix rehmanniae recens, radix rehmanniae praeparata and radix trichosanthis in a certain weight ratio. The drug has functions of nourishing yin for lowering fire, relieving restlessness to remove toxic substances, encouraging production of body fluids to extinguish thirst, clearing lung-heat, moistening dryness, activating blood, removing blood stasis and removing heat to cool blood, and takes effect quickly and has good curative effect when used for treating diabetes mellitus, and diabetes mellitus relapse is prevented. 本发明公开了种治疗糖尿病的药物及其制备方法，其是由黄芪、丹参、山药、苍术、玄参、生地黄、熟地黄、天花粉按定重量配比制备而成，本发明药物具有滋阴降火、除烦解毒、生津止渴、清肺润燥、活血祛瘀、清热凉血的功能，用于治疗糖尿病见效快、疗效好，不复发。