The invention relates to an intelligent system for fuel used for a monitoring vehicle, which includes an electric engine oil level sensor, an electric control emitter and a receiving display alarm; the electric engine oil level sensor is arranged inside a fuel box and connected with the electric control emitter which is connected with the power of the vehicle; the invention also includes an electromagnetic flow sensor, a vehicle speed sensor and an engine rotating speed sensor. The receiving display alarm includes a RF receiving circuit, a RF emitting circuit and a micro-controller circuit which are arranged in a box body, a display and a power provided with a template drive, a state setting key, a display window and a buzzer arranged on the panel of the box body; the electric control emitter includes the RF receiving circuit, the micro-controller circuit, the RF emitting circuit, a receiving signal circuit and the power. The intelligent system for fuel used by the monitoring vehicle has the beneficial effects of being capable of safely, reliably and continuously monitoring and storing the change of the oil storage amount of an oil storage box, automatically measuring, alarming foremergency and being suitable for the running environment conditions of various vehicles.