The invention belongs to the field of aeronautic and astronautic engine metering and regulating technological tests and particularly provides a fuel oil flow regulating device. The fuel oil flow regulating device comprises a stepping motor driving system and a fuel oil metering valve system. A fuel oil flow regulating application method comprises the following steps that the stepping motor drivingsystem is started, an oil input connector is connected to an oil pipe and all set, an oil pin is regulated to the k=0 state firstly, and at the moment, the vehicle is in a parked state; and by adopting the same foundation platform, regulating application of the parked state, a slow-vehicle state and a rapid-vehicle state can be completed. According to the fuel oil flow regulating device, conventional components and parts are adopted; practicality is high; the manufacturing cost is low; the cost performance is high; the structure is reasonable; safety is high; the structural design is reasonable; the structure is simple, and the cost is low; a fuel oil metering valve is small in moment of resistance and light in weight; design requirements are met by flow characteristics; by adopting the above-mentioned verification devices, supply of a platform for regulating application of the parked state, the slow-vehicle state and the rapid-vehicle state is completed; and high-precision advanced verification devices are achieved by utilizing the advantages.