The invention discloses a method for rejuvenating a
hirsutella hepialid strain, which specifically comprises the following steps of: step 1, inoculating a degenerated
hirsutella hepialid strain into an extractable stroma culture medium, and culturing until aerial hyphae are generated on the surface of a
bacterial colony; 2, performing variable-temperature stimulation on the bacterial colonies grown in the step 1, and producing sporocarp on the bacterial colonies; step 3, taking out the sporocarp in the step 2, performing tissue isolation, inoculating the sporocarp into a PDA culture medium, and culturing until the
diameter of a
hirsutella hepialid colony is 3cm; and 4, inoculating the hirsutella hepialid strain in the step 3 into a
shake flask liquid culture medium with the
inoculation amount of about 1cm < 2 > of
bacterial colony, filtering and collecting
mycelium after culture is completed, and
drying and detecting. Compared with a strain before rejuvenation, the strain rejuvenated by the method disclosed by the invention has the advantages that the
mycelium yield and the content of active ingredients in bacterial
powder are remarkably improved.