The invention discloses an intelligent auxiliary monitoring and control processing device and method based on an ARM platform, and the device comprises a main control and auxiliary processing module, an Ethernet PHY control module, a JTAG online downloading module, a serial port isolation module, an address dial-up module, and a main control power module. The main control and auxiliary processing module comprises a main control chip circuit, a 25MHz system clock crystal oscillator circuit, a 32.768KHz system real-time clock crystal oscillator circuit, a reset circuit, a WTD circuit, and a power supply circuit, wherein the 25MHz system clock crystal oscillator circuit and the 32.768KHz system real-time clock crystal oscillator circuit are in electrical connection with the main control chip circuit. The device is small in size, is high in precision, is small in external interference, is high in reliability and safety, and is simple and practical in circuit.