The invention relates to an audio frequency channel data access device. The device comprises an audio line interface module, a simulation signal processing module, a digital signal processing module, a one-chip microcomputer module, a serial port and a net port, wherein the audio line interface module connects with the simulation signal processing module, the simulation signal processing module connects with the digital signal processing module, the digital signal processing module connects with the one-chip microcomputer module, and the one-chip microcomputer module connects with the serial port and the net port. Beneficial effects of the invention are as follows: an audio frequency channel data access problem is solved by utilizing a present communication interface of an audio frequencyterminal device, accuracy and reliability of data transmission are raised by utilizing digital communication technology, data exchange with a host computer is realized by utilizing data communicationinterface technology, thus the host computer can realize data exchange and state control with the far-end audio frequency terminal device. So, the device has strong versatility.