The invention belongs to the technical field of LNG power ship gas engines, and relates to a fuel supply system suitable for LNG power ship gas engines. The provided fuel supply system suitable for the LNG power ship gas engines is provided with at least two parallel gas supply pipelines corresponding to one engine. The corresponding engine communicates with each gas supply pipeline through a second manual stop valve and a flame arrester. Each gas supply pipeline is provided with an LNG storage tank, a first manual stop valve, a first main gas fuel valve, a gasification device, a filter and a pressure reduction valve, all of which are sequentially connected. Each gas supply pipeline is further provided with a second main gas fuel valve corresponding to each engine. One end of each second main gas fuel valve communicates with the corresponding pressure reduction valve, and the other end of each second main gas fuel valve communicates with the corresponding engine. By means of the fuel supply system, the function that the multiple LNG storage tanks supply fuel to one or more engines at the same time is achieved.