The invention discloses a metal bipolar plate of a miniature fuel battery. The metal bipolar plate comprises an anode single-pole plate and a cathode single-pole plate having a same structure, the single-pole plate comprises an inlet end and an outlet end respectively positioned at two sides, and a flow path area positioned at a central section, the inlet end comprises a fuel inlet, a cooling medium inlet and an oxidizing agent inlet, the outlet end comprises a fuel outlet, a cooling medium outlet and an oxidizing agent outlet, a groove at a right side of the single-pole plate and a ridge forma right side channel of the single-pole plate, the right side channel of the anode single-pole plate is a fuel flow channel, the right side channel of the cathode single-pole plate is an oxidizing agent channel, the anode single-pole plate and the cathode single-pole plate are applied to form a cooling channel, and the oxidizing agent channel and the fuel flow channel are the snakelike flow channels. Three snakelike flow channels are arranged on the anode single-pole plate and the cathode single-pole plate, the gas conveying pressure of the bipolar plate is large, the drainage is good, the fuel concentration of the bipolar plate is uniform and consistent, the fuel utilization rate is increased, and the reaction efficiency of the fuel battery is high.