The present invention relates to a method and a device of preparing coffee. The method of preparing coffee according to one embodiment of the present invention includes a step of roasting coffee bean, and a step of spraying to the roasted coffee bean. According to the embodiment of the present invention, the step of spraying deep sea water includes a step of spraying deep sea water with minute particles.COPYRIGHT KIPO 2014한 실시예에 따른 커피 제조 방법은, 커피 원두를 로스팅하는 단계, 그리고 상기 로스팅한 커피 원두를 해양심층수로 도포하는 단계를 포함한다.
