The invention discloses a method for inducing and quickly propagating hairy roots of tartary buckwheat. The method includes (1), pre-cultivating sterile explants of the tartary buckwheat; (2), infecting the pre-cultivated explants of the tartary buckwheat by the aid of agrobacterium rhizogene infection liquid; (3), co-cultivating the infected explants; (4), transferring the co-cultivated explants into induction cultivation media and carrying out induction cultivation on the co-cultivated explants; (5), carrying out secondary cultivation and amplification cultivation on the hairy roots of the tartary buckwheat. The hairy roots of the tartary buckwheat are generated by means of induction. The method has the advantages that key parameters such as the explant pre-cultivation time, the agrobacterium rhizogene infection liquid concentration, the infection time, the co-cultivation time and the types of agrobacterium rhizogene which can obviously affect the induction efficiency for the hairy roots of the tartary buckwheat are optimized, accordingly, effects of inducing the hairy roots of the tartary buckwheat can be obviously improved, and the hairy roots of the tartary buckwheat can be quickly and efficiently induced; the method is applicable to inducing hairy roots of different varieties of tartary buckwheat, materials are convenient to obtain, the method is high in applicability and induction speed and easy and convenient to implement, heritance is stable, the cost can be saved, and the like.