The invention discloses a method of greening a bare slope by utilizing local herbaceous plants. The method comprises the following steps that the bare slope is cleaned, a net is fixed to the slop through anchor rods, and then plant growing matrix or casing soil is sprayed to the slope; when fruit clusters of thysanolaena maxima mature from the last ten-day of the May to the first ten-day period of the June, the fruit clusters of thysanolaena maxima are collected and threshed, and spikelet and caryopses of the thysanolaena maxima are obtained through screening; coconut chaff is placed into water and wetted, the coconut chaff is fished out after absorbing sufficient water, and the coconut chaff is evenly mixed with the spikelet and the caryopses, so that the spikelet and caryopses of the thysanolaena maxima absorb water; the coconut chaff mixed with the spikelet and caryopses of the thysanolaena maxima is mixed and stirred with pigeon pea seeds, fertilizers and water to make a spray-seeding material, the spray-seeding material is sprayed to slurry of the slope, and then the slope is covered with non-woven fabrics for maintenance until the slope is full of the thysanolaena maxima and pigeon pea plants. The method of greening the bare slope by utilizing the local herbaceous plants is simple to operate, high in greening success rate, obvious in greening effect and capable of achieving a green ecology and landscape effect.