The invention provides a culture medium for promoting the growth of morchella mycelia. For the culture medium, maltose is adopted as an optimal carbon source for culturing the morchella mycelia, ammonium tartrate is adopted as an optimal nitrogen source for culturing the morchella mycelia, high-purity chemical reagents with accurate ingredients are selected for preparation, so that the ingredients of the culture medium are accurate, and the quality control of the strains is facilitated. According to the nutrition ingredients required by the growth of the morchella mycelia, optimization is conducted, so that the growth speed of the morchella mycelia is accelerated, after inoculation is carried out for 7-9 days, the morchella mycelia grow on the whole inclined plane, the growth speed of the mycelia is improved by about 20% compared with the growth speed of the mycelia adopting a PDA culture medium, and the growth time of the morchella mycelia is shortened, in addition, the culture medium disclosed by the invention is simple in formula, wide in raw material source and low in cost, the production cost of the morchella can be reduced, and reliable technical support is provided for subsequent application of the morchella.