The invention discloses an automatic frequency-conversion energy-saving electronic speed regulation control system, which comprises an automatic speed regulation controller, a load detection instrument, a frequency-conversion compensator, a speed sensor and an electronic actuator, wherein the automatic speed regulation controller can receive external signals and current parameters, the load detection instrument is respectively in communication connection with the automatic controller and is used for detecting the current quantity of a load, the frequency-conversion compensator is used for regulating the output frequency and the voltage, the speed sensor is used for detecting the actual output rotating speed of a power generator, the electronic actuator is used for changing the oil supply quantity of an engine, and the speed sensor is also in communication and connection with the electronic actuator. The system of the invention carries out real-time detection through the power output onto the load, the detected signals are input into the system of the invention through digital-analog signal conversion, the collected operation parameters in a diesel engine are integrated, the control on an advance angle and an oil output quantity of an oil pump can be carried out, further, the automatic speed change control can be realized, finally, the regulation on the operation frequency of the diesel engine according to the size of the load can be realized, and the goal of fuel oil saving is reached.