Methanol fuel supply system and supply method thereof

The invention discloses a methanol fuel supply system, and relates to the technical field of fuel supply structures, the methanol fuel supply system comprises an isolation void, a fuel preparation room and a filling station, an integral fuel cabin is arranged in the isolation void, the filling station is connected with a filling pipe, the other end of the filling pipe enters the fuel preparation room and is communicated with a lightering pipe, a nitrogen pipeline is arranged on the filling pipe, and the nitrogen pipeline is communicated with the fuel preparation room. Purging the filling pipe; one end of the lightering pipe is communicated with the integral fuel cabin, the other end of the lightering pipe is connected with the lightering pump and communicated with the daily cabinet through the lightering pump, and the daily cabinet is communicated with a cabin outside the fuel preparation room through a pipeline. A joint position at the top of the fuel cabin is omitted, the fuel filling pipeline enters the fu