A communication adapter with error correction processing function and the application thereof are disclosed. The adapter comprises a DSP and corresponding power source control module, an active crystal oscillator module and a watchdog module; it is characterized in: the serial reception interface and the serial transmission interface of the DSP are respectively connected with a level conversion module and a RS232 interface; the RS 232 interfaces are respectively connected between the communication adapter, and the external transmission terminal and the external reception terminal; the generalpurpose digital quantity input and output port of the DSP are respectively provided with a reception state indication module, a receiving end baud rate display module, a transmission state indicationmodule, a transmitting end baud rate display module, an error correction processing digit number indication module, and a button module used for setting the baud rate, verification mode and error correction processing digit number of the DSP serial reception interface and the serial transmission interface. The invention can perform the communication between the communication terminals with different communication rates. The invention is used for performing the communication between the communication terminals with different communication rates.