The present invention discloses a method for producing water gas from palm tree empty fruit bunches. The method comprises the following steps of converting a raw material into palm biochar through physical and chemical reactions of drying and dehydration at 250°C-420°C by taking a waste of empty fruit bunches extruded from palm oil mill as raw material and then placing a carbon matrix in a water gas generator and converting the palm biochar into a water gas fuel. The preparation method of the present invention is simple, the conversion rate of converting the palm biocarbon into the water gas is high, and the obtained water gas is low in pollution and high in heat energy. The present invention provides a novel method for treatment and reuse of a palm oil processing waste, and can be used as an effective substitute for a non-renewable energy source which is coal for producing the water gas.