The invention discloses a liquid inoculation method for artificially planting cistanche. The liquid inoculation method includes the following steps of cistanche seed grading, screening and germinating treatment, modifying of an inoculating device, inoculating liquid preparing, inoculating ditch excavating, farmyard manure fertilizing, liquid inoculating, inoculating ditch backfilling and conventional irrigation management after watering for the first time and soil moisture filling. The liquid inoculation method has the advantages that by the liquid inoculation method for cistanche seeds, germination, growing and restoring of host root systems can be promoted, distance between the seeds and the host root systems can be shortened, inoculating section can be expanded to increase contact probability of the seeds and host roots, and inoculating success rate and yield are increased while seed consumption is reduced. Experiments show that compared with methods of direct broadcast sowing and seed paper inoculating, the liquid inoculation method is seed saving, convenient for operation, short in inoculation period and highest in inoculation rate, spray gun equipment with diameter of 2.0mm and used in the method is medium in seed spraying quantity and good in spraying effect, seed consumption is reduced due to spraying, and the liquid inoculation method is high in inoculation rate, convenient for operation during production and easy for popularization.