The invention discloses a method for measuring instantaneous oil consumption of an electronic control unit pump diesel engine, which comprises the following steps of: obtaining a basic fuel jet pulse width in the speed regulating characteristic by an average rotating speed of the diesel engine and the position of an accelerator pedal, calculating a rotating speed of an oil pump by the average rotating speed of the diesel engine and checking the oil-pump oil supply characteristic of a unit pump by the basic fuel jet pulse width and an average rotating speed of the oil pump so as to obtain current circulating oil supply; and by acquiring a rotating angle of a 6-degree crankshaft of a crankshaft signal panel, calculating a current instantaneous rotating speed of the diesel engine so as to obtain a fundamental quantity of the instantaneous oil consumption, and by acquiring a current fuel oil temperature, carrying out density correction on the fundamental quantity of the instantaneous oil consumption, so that the accurate instantaneous oil consumption of the diesel engine in a current state can be obtained and the information of the accurate instantaneous oil consumption of the diesel engine can help a driver master a current operating state of a vehicle in real time.