The present invention relates to a drone for spraying agricultural chemicals and a method for spraying agricultural chemicals using the same. An objective of the present invention is to provide a drone for spraying agricultural chemicals and a method for spraying agricultural chemicals using the same which circulate and spray a portion of agricultural chemicals transported to a composite nozzle into a storage tank to create a vortex in the storage tank to prevent agricultural chemical sediment from being created in the storage tank when spraying agricultural chemicals, and efficiently detect a collision obstacle located on a moving path of a drone to safely fly the drone to an agricultural chemical spray target area to spray agricultural chemicals. The drone for spraying agricultural chemicals comprises: a flying body positioned to have a prescribed height from the ground by support legs； a plurality of rotors connected and installed to be radially positioned around the flying body to allow flight of the flying body； an agricultural chemical storage container including an agricultural chemical spray unit installed on a lower side of the flying body to be positioned between the support legs, wherein the agricultural chemical spray unit is detachably installed； a plurality of composite nozzles to receive agricultural chemicals in the agricultural chemical storage container to spray the agricultural chemicals； an agricultural chemical transport unit to transport the agricultural chemicals in the agricultural chemical storage container to the composite nozzles； and an agricultural chemical circulation spray unit which is installed to be connected to the agricultural chemical transport unit and the agricultural chemical storage container, and circulates a portion of the agricultural chemicals supplied to the composite nozzles from the agricultural chemical storage container to spray the portion of the agricultural chemicals into the agricultural chemical storage containe
