The present invention relates to a method of preparing a functional material-containing coffee. The purpose of the present invention is to produce a coffee which improves competitiveness of coffee and may help in the health by containing β-glucan, cordycepin and polyphenol known to help in anticancer and immunity enhancement in general coffee having weak competitiveness. The method of the present invention comprises: a step (a) of mixing a chaga mushroom powder with a Cordyceps militaris powder at a weight ratio of 5:5 to prepare a mixed powder； a step (b) of adding 100 g of the mixed powder of the step (a) per 1 kg of potable water, extracting a mixture of potable water and the mixed powder at the temperature of 80 to 90°C for 5 hours to obtain an extract, and filtering the extract to obtain a filtered extract； a step (c) of mixing 1 kg of coffee beans per 1 kg of the extract of the step (b) to obtain a mixture, steaming the mixture at the temperature of 90 to 100°C for 3 hours, and cooling the steamed mixture to the temperature of 20°C or lower； a step (d) of mixing 1 kg of the extract of the step (b) per 1 kg of a cooled material of the step (c) to prepare a resulting material； a step (e) of inoculating lactic acid bacteria to the material of the step (d) to ferment the material having the lactic acid bacteria inoculated thereto at the temperature of 25 to 38°C for 3 to 5 days； a step (f) of drying a fermented material of the step (e) to a water content of 10% or less； a step (g) of roasting dried coffee beans of the step (f)； and a step (h) of commercializing a roasting-completed coffee of the step (g).본 발명은 기능성물질이 함유된 커피의 제조방법에 관한 것으로서, 과제 해결 수단으로는 (a) 차가버섯분말 : 동충하초분말을 5 : 5의 중량비로 혼합하여 준비하는 단계； (b) 식용수 1kg당 (a)단계의 혼합된 분말 100g을 첨가하여 80 ~ 90℃의 온도에서 5시간동안 추출하여 여과하여 준비하는 단계； (c) 상기 (b)단계의 추출액 1kg당 커피생두 1kg을 혼합하여 90 ~ 100℃의 온도에서 3시간동안 증숙한 다음 20℃이하의 온도냉각하는 단계； (d) (c)단계의 냉각된 재료 1kg당 (상기(b)단계의 추출액 1kg을 혼합하여 준비하는 단계； (e) 상기 (d)단계의 재료에 유산균을 접종하여 25 ~ 38℃의 온도에서 3일 ~ 5일동안
