Disclosed is a control system for achieving voice frequency remote access and playback. The system is developed by using RT-Thread RTOS, the functions of file reading and file transfer can be achieved by using a file system and a transmission control protocol/Internet protocol (TCP/IP) protocol stack of the system. The operating system comprises a bottom layer hardware drive program module which is used for driving bottom layer hardware, a board support package which is related to a central processing unit (CPU) and a circuit board, a kernel module which covers a fully preemptive type real-time operating system and an upper layer application module which is irrelevant to concrete relation of a bottom layer. According to the control system for achieving the voice frequency remote access and playback, an existing power line of a field can be used for mounting the system, rewiring is needless, mounting efficiency is improved, and user cost is saved.