The invention relates to a device for testing the flow of a lubricating oil nozzle of an engine, belonging to the technical field of space shuttle engines. The device comprises an oil receiving cup, a first switching pipe, a second switching pipe, a third switching pipe, a working room, an oil return tank, an oil collecting pipe, a two-position three-way electromagnetic valve, an oil metering cup, a first electromagnetic valve, a second electromagnetic valve, an oil return pump, an oil supply pump and a combined oil tank, wherein the combined oil tank comprises an oil collector, a vacuum oil tank, a consumption oil tank, a third electromagnetic valve, a fourth electromagnetic valve and a vacuum pump. With the structure of a vacuum combined split oil tank, the device can remove air dissolved in lubricating oil. An upper and a lower split oil tanks are used, wherein the lower oil tank is used for supplying oil, and the upper vacuum oil tank is used for removing the dissolved air. For the compatibility of different types of nozzles, the designed oil receiving cup can flex and rotate according to different oil receiving distances and angles, can be used for testing different types of nozzles and reduce the labor intensity of workers.