Preparation method of improved potato dextrose agar medium

The invention discloses a preparation method of an improved potato dextrose agar medium. The preparation method comprises the following steps: washing fresh potatoes, soaking potato blocks by bromoethane for 96h-108h in a closed container at the temperature of 25+/-1 DEG C, at the relative humidity of 85% and at the absence of light, opening the container for ventilating for 30 min or more, weighing the processed potato blocks, adding water into the potato blocks and boiling for 10 min, filtering by adopting double-layer gauze, supplementing with water up to the original water amount, respectively adding glucose and agar, and carrying out sterilization after complete melting. The preparation method is simple and practical, the culturing speed of the PDA medium for fungi is obviously accelerated, and thus the improved potato dextrose medium has a wide promotional practical value.