Bletilla multiplying culture medium for preventing browning phenomenon

The invention discloses a bletilla multiplying culture medium for preventing a browning phenomenon. The bletilla multiplying culture medium comprises the following raw materials in parts by weight: modified MS culture medium, 0.5-1.05mg/L 6-BA, 1.0-1.5mg/L 2,4-D, 15-20mg/L ascorbic acid, 0-1.2mg/L rare earth element, 0-1.5mg/L ethylene chlorohydrin, 0-1.1mg/L KT and 0-1.3mg/L fluconazole, whereinagar strip is replaced with starch in the modified MS culture medium; 1g agar strip is replaced with 1.5g starch; microelements, ferric salt and organic ingredients in the modified MS culture medium are as same as those in MS culture medium; the modified MS culture medium comprises the following macro-elements: 700mg/L nitrate, 600mg/L ammonium nitrate, 185mg/L magnesium sulfate heptahydrate, 60mg/L monopotassium phosphate and 165mg/L calcium chloride dihydrate. The bletilla multiplying culture medium disclosed by the invention has an excellent seed multiplying effect and is capable of effectively preventing the brown