The invention relates to the technical field of modern electronic application, particularly to an intelligent electric control system. The intelligent electric control system consists of a microprocessor, a sensor module, a sampling circuit, an electric energy metering module, a clock module, a storing module, a relay and an output module, wherein the sensor module, the sampling circuit and the electric energy metering module are in series connection with one another sequentially, and are connected to the microprocessor through the electric energy metering module; all the clock module, the storing module, the relay and the output module are directly connected to the microprocessor; the output module comprises a button module, a data interface module RS485 and an LCD display module; the data interface module is connected to a card reader module; the LCD is connected to an upper computer. According to the intelligent electric control system, historical data such as effective values of voltage and current, power and electricity consumption is preserved in an E<2>PROM, and is refreshed continuously, so that the failure process can be checked when a failure occurs.