The invention relates to a double-membrane methane cabinet condensation water anti-freezing system and method. The system comprises a methane cabinet foundation electric heating device and an electric heating control system. The methane cabinet foundation electric heating device is buried in the foundation below a double-membrane methane cabinet, and is attached to the ground, and the heating area adapts to the bottom area of an inner membrane in a double-membrane methane cabinet; the methane cabinet foundation electric heating device is controlled by an electric heating control system, and the electric heating control system and a double-membrane methane cabinet control system achieve interconnected control. The electric heating manner is adopted to enable condensate water of the inner membrane of the double-membrane methane cabinet to be free of freezing under the low-temperature environment, continuous and stable exhaust is achieved, and safe and stable running of the double-membrane methane cabinet is ensured.