Intelligent digital display instrument

The invention relates to an intelligent digital display instrument, which comprises a power supply unit, a metering unit, a keyboard input unit, a storage, an LED (Light-Emitting Diode) driving control unit, a CPU (Central Processing Unit) main control unit, a switching value input circuit and a relay output circuit, wherein the CPU main control unit is used for receiving a power metering parameter output by the metering unit, and scanning and displaying the value, magnitude order and unit of the power metering parameter on an LED digital tube in a correlative way through the LED driving control unit; the SPI (Serial Peripheral Interface) communication interface of the metering unit is connected to the first universal I/O (Input/Output) interface of the CPU main control unit; the serial port of the storage is connected to the I2C (Inter-integrated Circuit) serial interface of the CPU main control unit; the serial port of the LED driving control unit is connected to the second universal I/O interface of the CPU main control unit; and the output end of the keyboard input unit is connected to the third universal I/O interface of the CPU main control unit. The CPU main control unit is only used for controlling and scanning a quantity value to be displayed and closing output of other irrelevant quantity values, so that a user can read the power parameter value rapidly and visually.