Disclosed is a fuel providing system of a ship. According to an embodiment of the present invention, the fuel providing system of a ship comprises: a low-pressure compression unit which compresses evaporative gas supplied from a storage tank to meet a fuel supply condition of a first demander requiring low-pressure fuel; a heat exchange unit which liquefies fluids exceeding the fuel supply of the first demander in the compressed evaporative gas; an inflator which inflates the liquefied fluids that have passed through the heat exchange unit; a gas-liquid separator which separates the inflated fluids into gas and liquid; an evaporative gas supply line which connects the storage tank, the low-pressure compression unit, the heat exchange unit, the inflator, and the gas-liquid separator and supplies gaseous components separated by the gas-liquid separator to a front end of the low-pressure compression unit through the heat exchange unit; a first fuel supply line which branches from a gap between the low pressure compression unit and the heat exchange unit of the evaporative gas supply line and is connected to the first demander; a pressurization pump which pressurizes liquefied gas supplied from the storage tank; and a second fuel supply line which connects the storage tank, the pressurization pump, the heat exchange unit, and a second demander requiring fuel with a greater pressure compared to the first demand, and supplies the pressurized liquefied gas to the second demander through the heat exchange unit. Accordingly, the present invention can increase operation efficiency by compressing evaporative gas generated from the storage tank to low pressure and supplying the same to a low-pressure demander.

선박의 연료공급시스템이 개시된다. 본 발명의 실시 예에 의한 선박의 연료공급시스템은 저장탱크로부터 공급받은 증발가스를 저압 연료를 필요로 하는 제1수요처의 연료공급조건에 맞게 압축시키는 저압압축부; 압축된 증발가스 중 제1수요처의 연료공급량을 초과한 유량을 액화시키는 열교환부; 열교환부를 통과한 액화된 유체를 팽창시키는 팽창기; 팽창된 유체를 기액 분리시키는 기액분리기; 저장탱크, 저압압축부, 열교환부, 팽창기 및 기액분리기를 연결하며, 기액분리기에 의해 분리된 기체성분을 열교환부를 거쳐 저압압축부의 전단으로 공급하는 증발가스공급라인; 증발가스공급라인의 저압압축부와 열교환부 사이로부터 분기되어, 제1수요처와 연결된 제1연료공급라인; 저장탱크로부터 공급받은 액화가스를 가압하는 가압펌프; 및 저장탱크, 가압펌프, 열교환부 및 제1수요처보다 큰 압력의 연료를 필요로 하는 제2수요처를 연결하며, 가압된 액화가스를 열교환부를 거쳐 상기 제2수요처로 공급하는 제2연료공급라인;을 포함한다.