The invention discloses a field cultivation method of purple-flower bletilla striata tissue culture seedlings. The method includes the following steps of 1, selecting a suitable land parcel for planting bletilla striata; 2, conducting deep ploughing and soil smashing on the selected land parcel; 3, conducting light shielding on the whole planting land parcel and erecting a sprinkling irrigation system; 4, conducting seedling hardening; 5, conducting transplanting; 6, conducting field management. According to a planting technique of the purple-flower bletilla striata tissue culture seedlings, harvesting can be achieved only within two years, and the yield per mu can reach about 2.5 tons. The suitable land parcel is selected according to environmental conditions suitable for survival of bletilla striata, and the great environmental conditions are provided for good growth of bletilla striata after bletilla striata is transplanted into the field; furthermore, by preparing the soil, alleviating soil hardening, carrying out steam sterilization to assist in plastic film mulching, killing pest eggs and weed seeds and the like, elimination of weeds at the early stage of transplanting is achieved, the situation that the growth of the seedlings is influenced since there are too many weeds during a seedling period is avoided, and the adverse impact generated on roots of the seedlings by weeding since the bletilla striata tissue culture seedlings grow slowly and the plants are small is overcome.