The invention relates to an automatic recycle feed device of a liquid-fuel cell, which belongs to the field of liquid-fuel batteries, in particular to an automatic recycle feed device for liquid-fuelcells. The automatic recycle feed device is formed by an automatic recycle feed device and a liquid-fuel cell. A gas-liquid separating cap is adhered in the upper end hole of a casing through fluid sealant in the automatic recycle feed device, the upper portion of the inner cavity of the casing is provided with a total liquid storage container, the lower portion of the inner cavity is provided with a reaction zone fuel cavity, and a cross rib is arranged between the total liquid storage container and the reaction zone fuel cavity. An anode polar plate, a membrane electrode, a cathode polar plate and a cathode end plate are mounted on the right of an anode end plate in the liquid-fuel cell in turn, and the automatic recycle feed device and the liquid-fuel cell are fixed together through a bolt and a nut. The automatic recycle feed device can automatically control liquid fuel to be injected into the reaction zone fuel cavity by gas generated when a fuel cell is working through a feed pipe from the total liquid storage container, which needs not external power, and has the advantages of simple structure, low production cost, stable work and reliable performance.