The invention provides a direct injection type gas/liquid fuel supply system of a rotary engine. The direct injection type gas/liquid fuel supply system comprises the rotary engine, a gas injection system, a liquid injection system and an electronic control unit (ECU). The rotary engine comprises a cylinder, combustors and a triangular rotor, wherein the combustors are located between the cylinder and the triangular rotor, and the cylinder is internally provided with an exhaust pipe which communicates with the third combustor. The liquid injection system comprises a liquid fuel nozzle and a sparking plug, the liquid fuel nozzle is arranged on the cylinder and communicates with the second combustor, and the second combustor is internally provided with the sparking plug. The gas injection system comprises a second gas fuel nozzle, and the second gas fuel nozzle is arranged on the cylinder and communicates with the first combustor. The ECU is connected with the sparking plug, the liquid fuel nozzle, a revolution speed transducer and the second gas fuel nozzle. The direct injection type gas/liquid fuel supply system can accurately control the injection strategy of gas fuel and liquid fuel and the ignition strategy of the sparking plug to reasonably recognize formation and reliable ignition of mixed gas.