The invention relates to the technical field of automobiles, in particular to a direct injection gasoline-natural gas dual-fuel engine control system and control method. The direct injection gasoline-natural gas dual-fuel engine control system comprises a natural gas supply system, an original direct injection gasoline engine electronic control system and further an electronic control unit (ECU),wherein the electronic control unit is correspondingly connected with the natural gas supply system and the original direct injection gasoline engine electronic control system. According to the directinjection gasoline-natural gas dual-fuel engine control system and control method, an original engine electric control system and the electronic control unit are adopted to jointly control the working process of a natural gas-gasoline double-fuel engine, the ECU of the engine can normally work, and meanwhile control of the electronic throttle valve is realized; and in addition, parameters such asignition energy, the natural gas injection amount, the gasoline injection amount of the dual-fuel engine can be accurately controlled through the electronic control unit, the cost is saved while theperformance requirement is met, and the maintenance difficulty is reduced.