Methanol fuel cabin pressure balancing system

The invention provides a pressure balancing system of a methanol fuel cabin. According to the pressure balancing system for the methanol fuel cabin, a first methanol storage cabin and a second methanol storage cabin convey liquid into a methanol daily cabin through methanol drain pipes, and the methanol daily cabin conveys gas into the first methanol storage cabin and the second methanol storage cabin through gas return pipes respectively; automatic pressure balance can be achieved between the first methanol storage cabin and the methanol daily cabin and between the second methanol storage cabin and the methanol daily cabin, dependence on an external nitrogen source in the methanol lightering process is reduced, the pressure in the first methanol storage cabin, the pressure in the second methanol storage cabin and the pressure in the methanol daily cabin are kept stable, and the reliability of methanol lightering is improved. The storage and transportation safety of the methanol fuel is improved, the energy c