The invention discloses a dendrobium officinale bonsai cultivation method. The method comprises the following steps of 1, selecting seedlings of dendrobium officinale, putting a cultivation medium into a pelelith flowerpot, and then planting the seedlings of dendrobium officinale into the pelelith flowerpot; 2, conducting water and fertilizer management; 3, adopting and spraying a 500-2,000 fold paclobutrazol solution with the effective component content accounting for 15% to the plants 1-3 times every 15-20 days at least 7 days after the seedlings of dendrobium officinale are transplanted. By means of the dendrobium officinale bonsai cultivation method, the pelelith flowerpot serves as a cultivation container of dendrobium officinale, since the inside of pelelith has many pores, partial water can be stored and then slowly released to the cultivation medium, the humidity of the medium can be effectively maintained, as is tested, the watering period can be prolonged by 3-7 days under a common indoor environment, and the manual watering frequency is effectively lowered. By spraying paclobutrazol multiple times, the joint spacing of dendrobium officinale is effectively reduced, the situation that dendrobium officinale gets spindling due to insufficient illumination is prevented, and thus the overall ornament value of dendrobium officinale is increased.