The utility model discloses a medicine applying device for a leech culture pond. The device comprises a culture pond and an objective table, wherein the culture pond is uniformly divided into a plurality of groups of culture chambers by a plurality of groups of clapboards; an objective table is arranged on one side of the culture pond; a pesticide box is arranged on the upper side of the objectivetable; horizontal extension pipes are arranged in the middles of the upper sides of the breeding chambers; the extension pipes are fixedly connected through a connecting pipe; the connecting pipe ispositioned right above the objective table; the culture pond is divided into a plurality of culture chambers by partition plates; wherein the manual pressure pump is fixed on one side of the pesticidebox; powering liquid medicine, the liquid medicine enters the medicine inlet pipe through the L-shaped medicine outlet pipe; the first throttle valves at the two ends of the pesticide inlet pipe playa role in opening and closing, the flow direction of pesticide liquid is adjusted, the pesticide liquid is sprayed into the breeding chamber through the spray head, the manual pressure pump is arranged in the pesticide box, pesticide can be conveyed into different pesticide liquid chambers by moving the pesticide box, use of the pressure pump and the pesticide box is reduced, and cost is saved.