The invention discloses a perfoliote knotweed herb planting method, which comprises the following steps: when persistent tapels on the spicate infructescences of perfoliote knotweed herbs become blue and the seeds are black, harvesting the seeds; placing the seeds into a basin, removing the persistent blue tapels of fruits through rubbing, and drying; putting the obtained products in storage, wherein the storage conditions are as follows: the temperature is 0-5 DEG C, and the humidity is 20-60%; placing the seeds into a basin filled with warm water at a temperature of 30-35 DEG C, after the seeds are soaked for 24 h, drying the seeds, thoroughly watering a seedbed firstly, casting the seeds in a proportion of 100-150 grains / m<2>, and uniformly covering the seeds at a depth of 1-2 cm by using fine soil; selecting a rainy day, digging well-grown perfoliote knotweed herb seedlings with soil from the seedbed, and planting the seedlings in cultivated fields according to a planting space of 50cm*50cm; carrying out field management; and harvesting. Perfoliote knotweed herbs obtained by using the method disclosed by the invention are stable in quality, less in planting investment and high in benefits, and can promote local economic development.